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Finding the Fourth Proportional to 9,138.72, 12,606.48 and 5,775.24

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Solution

The fourth proportional to 9,138.72, 12,606.48 and 5,775.24 is: 7,966.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,138.72 : 12,606.48 = 5,775.24 : x
  2. Step 2: Convert to fraction form
    9,138.72/12,606.48 = 5,775.24/x
  3. Step 3: Cross multiply
    9,138.72x = 12,606.48 × 5,775.24
  4. Step 4: Simplify right side
    9,138.72x = 72,805,447.56
  5. Step 5: Solve for x
    x = 72,805,447.56/9,138.72
  6. Step 6: Final answer
    x = 7,966.70

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Double scale
Find fourth proportional to 9,139.72, 12,607.86 and 5,776.24
Similar ratio
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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.