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Finding the Fourth Proportional to 65,513.56, 90,405.66 and 38,657.20

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Solution

The fourth proportional to 65,513.56, 90,405.66 and 38,657.20 is: 53,345.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,513.56 : 90,405.66 = 38,657.20 : x
  2. Step 2: Convert to fraction form
    65,513.56/90,405.66 = 38,657.20/x
  3. Step 3: Cross multiply
    65,513.56x = 90,405.66 × 38,657.20
  4. Step 4: Simplify right side
    65,513.56x = 3,494,829,679.75
  5. Step 5: Solve for x
    x = 3,494,829,679.75/65,513.56
  6. Step 6: Final answer
    x = 53,345.13

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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.