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Finding the Fourth Proportional to 285,385.20, 428,077.80 and 145,417.20

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Solution

The fourth proportional to 285,385.20, 428,077.80 and 145,417.20 is: 218,125.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,385.20 : 428,077.80 = 145,417.20 : x
  2. Step 2: Convert to fraction form
    285,385.20/428,077.80 = 145,417.20/x
  3. Step 3: Cross multiply
    285,385.20x = 428,077.80 × 145,417.20
  4. Step 4: Simplify right side
    285,385.20x = 62,249,875,058.16
  5. Step 5: Solve for x
    x = 62,249,875,058.16/285,385.20
  6. Step 6: Final answer
    x = 218,125.80

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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.