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Finding the Fourth Proportional to 85,476.90, 128,214.15 and 38,729.70

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Solution

The fourth proportional to 85,476.90, 128,214.15 and 38,729.70 is: 58,094.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,476.90 : 128,214.15 = 38,729.70 : x
  2. Step 2: Convert to fraction form
    85,476.90/128,214.15 = 38,729.70/x
  3. Step 3: Cross multiply
    85,476.90x = 128,214.15 × 38,729.70
  4. Step 4: Simplify right side
    85,476.90x = 4,965,695,565.26
  5. Step 5: Solve for x
    x = 4,965,695,565.26/85,476.90
  6. Step 6: Final answer
    x = 58,094.01

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.