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Finding the Fourth Proportional to 9,138.70, 12,611.55 and 5,364.73

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Solution

The fourth proportional to 9,138.70, 12,611.55 and 5,364.73 is: 7,403.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,138.70 : 12,611.55 = 5,364.73 : x
  2. Step 2: Convert to fraction form
    9,138.70/12,611.55 = 5,364.73/x
  3. Step 3: Cross multiply
    9,138.70x = 12,611.55 × 5,364.73
  4. Step 4: Simplify right side
    9,138.70x = 67,657,560.63
  5. Step 5: Solve for x
    x = 67,657,560.63/9,138.70
  6. Step 6: Final answer
    x = 7,403.41

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Half scale
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Double scale
Find fourth proportional to 9,139.70, 12,612.93 and 5,365.73
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.