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Finding the Fourth Proportional to 65,321.59, 90,139.26 and 38,458.40

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Solution

The fourth proportional to 65,321.59, 90,139.26 and 38,458.40 is: 53,069.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,321.59 : 90,139.26 = 38,458.40 : x
  2. Step 2: Convert to fraction form
    65,321.59/90,139.26 = 38,458.40/x
  3. Step 3: Cross multiply
    65,321.59x = 90,139.26 × 38,458.40
  4. Step 4: Simplify right side
    65,321.59x = 3,466,611,085.81
  5. Step 5: Solve for x
    x = 3,466,611,085.81/65,321.59
  6. Step 6: Final answer
    x = 53,069.91

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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.