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Finding the Fourth Proportional to 85,378.60, 127,964.16 and 60,425.92

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Solution

The fourth proportional to 85,378.60, 127,964.16 and 60,425.92 is: 90,565.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,378.60 : 127,964.16 = 60,425.92 : x
  2. Step 2: Convert to fraction form
    85,378.60/127,964.16 = 60,425.92/x
  3. Step 3: Cross multiply
    85,378.60x = 127,964.16 × 60,425.92
  4. Step 4: Simplify right side
    85,378.60x = 7,732,352,095.03
  5. Step 5: Solve for x
    x = 7,732,352,095.03/85,378.60
  6. Step 6: Final answer
    x = 90,565.46

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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.