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Finding the Fourth Proportional to 85,319.60, 127,979.40 and 54,292.40

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Solution

The fourth proportional to 85,319.60, 127,979.40 and 54,292.40 is: 81,438.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,319.60 : 127,979.40 = 54,292.40 : x
  2. Step 2: Convert to fraction form
    85,319.60/127,979.40 = 54,292.40/x
  3. Step 3: Cross multiply
    85,319.60x = 127,979.40 × 54,292.40
  4. Step 4: Simplify right side
    85,319.60x = 6,948,308,776.56
  5. Step 5: Solve for x
    x = 6,948,308,776.56/85,319.60
  6. Step 6: Final answer
    x = 81,438.60

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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.