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Finding the Fourth Proportional to 65,685.02, 90,640.11 and 42,988.07

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Solution

The fourth proportional to 65,685.02, 90,640.11 and 42,988.07 is: 59,320.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,685.02 : 90,640.11 = 42,988.07 : x
  2. Step 2: Convert to fraction form
    65,685.02/90,640.11 = 42,988.07/x
  3. Step 3: Cross multiply
    65,685.02x = 90,640.11 × 42,988.07
  4. Step 4: Simplify right side
    65,685.02x = 3,896,442,940.29
  5. Step 5: Solve for x
    x = 3,896,442,940.29/65,685.02
  6. Step 6: Final answer
    x = 59,320.12

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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.