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Finding the Fourth Proportional to 9,915.35, 13,608.47 and 9,070.65

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Solution

The fourth proportional to 9,915.35, 13,608.47 and 9,070.65 is: 12,449.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,915.35 : 13,608.47 = 9,070.65 : x
  2. Step 2: Convert to fraction form
    9,915.35/13,608.47 = 9,070.65/x
  3. Step 3: Cross multiply
    9,915.35x = 13,608.47 × 9,070.65
  4. Step 4: Simplify right side
    9,915.35x = 123,437,691.08
  5. Step 5: Solve for x
    x = 123,437,691.08/9,915.35
  6. Step 6: Final answer
    x = 12,449.16

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.