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Finding the Fourth Proportional to 10,920.11, 15,065.08 and 7,136.71

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Solution

The fourth proportional to 10,920.11, 15,065.08 and 7,136.71 is: 9,845.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,920.11 : 15,065.08 = 7,136.71 : x
  2. Step 2: Convert to fraction form
    10,920.11/15,065.08 = 7,136.71/x
  3. Step 3: Cross multiply
    10,920.11x = 15,065.08 × 7,136.71
  4. Step 4: Simplify right side
    10,920.11x = 107,515,051.58
  5. Step 5: Solve for x
    x = 107,515,051.58/10,920.11
  6. Step 6: Final answer
    x = 9,845.61

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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.