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Finding the Fourth Proportional to 12,390.79, 17,099.79 and 7,085.60

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Solution

The fourth proportional to 12,390.79, 17,099.79 and 7,085.60 is: 9,778.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,390.79 : 17,099.79 = 7,085.60 : x
  2. Step 2: Convert to fraction form
    12,390.79/17,099.79 = 7,085.60/x
  3. Step 3: Cross multiply
    12,390.79x = 17,099.79 × 7,085.60
  4. Step 4: Simplify right side
    12,390.79x = 121,162,272.02
  5. Step 5: Solve for x
    x = 121,162,272.02/12,390.79
  6. Step 6: Final answer
    x = 9,778.42

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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.