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Finding the Fourth Proportional to 91,539, 136,929.36 and 85,940.28

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Solution

The fourth proportional to 91,539, 136,929.36 and 85,940.28 is: 128,554.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,539 : 136,929.36 = 85,940.28 : x
  2. Step 2: Convert to fraction form
    91,539/136,929.36 = 85,940.28/x
  3. Step 3: Cross multiply
    91,539x = 136,929.36 × 85,940.28
  4. Step 4: Simplify right side
    91,539x = 11,767,747,538.62
  5. Step 5: Solve for x
    x = 11,767,747,538.62/91,539
  6. Step 6: Final answer
    x = 128,554.47

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.