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Finding the Fourth Proportional to 42,391.80, 63,587.70 and 25,784.40

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Solution

The fourth proportional to 42,391.80, 63,587.70 and 25,784.40 is: 38,676.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,391.80 : 63,587.70 = 25,784.40 : x
  2. Step 2: Convert to fraction form
    42,391.80/63,587.70 = 25,784.40/x
  3. Step 3: Cross multiply
    42,391.80x = 63,587.70 × 25,784.40
  4. Step 4: Simplify right side
    42,391.80x = 1,639,570,691.88
  5. Step 5: Solve for x
    x = 1,639,570,691.88/42,391.80
  6. Step 6: Final answer
    x = 38,676.60

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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.