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Finding the Fourth Proportional to 420,597.13, 630,860.15 and 136,281.66

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Solution

The fourth proportional to 420,597.13, 630,860.15 and 136,281.66 is: 204,410.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,597.13 : 630,860.15 = 136,281.66 : x
  2. Step 2: Convert to fraction form
    420,597.13/630,860.15 = 136,281.66/x
  3. Step 3: Cross multiply
    420,597.13x = 630,860.15 × 136,281.66
  4. Step 4: Simplify right side
    420,597.13x = 85,974,668,810.55
  5. Step 5: Solve for x
    x = 85,974,668,810.55/420,597.13
  6. Step 6: Final answer
    x = 204,410.97

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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.