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Finding the Fourth Proportional to 65,490.48, 90,387.78 and 38,639.64

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Solution

The fourth proportional to 65,490.48, 90,387.78 and 38,639.64 is: 53,329.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,490.48 : 90,387.78 = 38,639.64 : x
  2. Step 2: Convert to fraction form
    65,490.48/90,387.78 = 38,639.64/x
  3. Step 3: Cross multiply
    65,490.48x = 90,387.78 × 38,639.64
  4. Step 4: Simplify right side
    65,490.48x = 3,492,551,279.60
  5. Step 5: Solve for x
    x = 3,492,551,279.60/65,490.48
  6. Step 6: Final answer
    x = 53,329.14

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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.