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Finding the Fourth Proportional to 85,615.70, 128,337.15 and 38,902.10

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Solution

The fourth proportional to 85,615.70, 128,337.15 and 38,902.10 is: 58,313.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,615.70 : 128,337.15 = 38,902.10 : x
  2. Step 2: Convert to fraction form
    85,615.70/128,337.15 = 38,902.10/x
  3. Step 3: Cross multiply
    85,615.70x = 128,337.15 × 38,902.10
  4. Step 4: Simplify right side
    85,615.70x = 4,992,584,643.02
  5. Step 5: Solve for x
    x = 4,992,584,643.02/85,615.70
  6. Step 6: Final answer
    x = 58,313.89

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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.