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Finding the Fourth Proportional to 65,529.76, 90,409.68 and 38,663.20

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Solution

The fourth proportional to 65,529.76, 90,409.68 and 38,663.20 is: 53,342.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,529.76 : 90,409.68 = 38,663.20 : x
  2. Step 2: Convert to fraction form
    65,529.76/90,409.68 = 38,663.20/x
  3. Step 3: Cross multiply
    65,529.76x = 90,409.68 × 38,663.20
  4. Step 4: Simplify right side
    65,529.76x = 3,495,527,539.78
  5. Step 5: Solve for x
    x = 3,495,527,539.78/65,529.76
  6. Step 6: Final answer
    x = 53,342.60

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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.