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Finding the Fourth Proportional to 285,557.20, 428,335.80 and 85,908.40

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Solution

The fourth proportional to 285,557.20, 428,335.80 and 85,908.40 is: 128,862.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,557.20 : 428,335.80 = 85,908.40 : x
  2. Step 2: Convert to fraction form
    285,557.20/428,335.80 = 85,908.40/x
  3. Step 3: Cross multiply
    285,557.20x = 428,335.80 × 85,908.40
  4. Step 4: Simplify right side
    285,557.20x = 36,797,643,240.72
  5. Step 5: Solve for x
    x = 36,797,643,240.72/285,557.20
  6. Step 6: Final answer
    x = 128,862.60

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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.