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Finding the Fourth Proportional to 921,956, 1,272,299.28 and 498,020

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Solution

The fourth proportional to 921,956, 1,272,299.28 and 498,020 is: 687,267.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    921,956 : 1,272,299.28 = 498,020 : x
  2. Step 2: Convert to fraction form
    921,956/1,272,299.28 = 498,020/x
  3. Step 3: Cross multiply
    921,956x = 1,272,299.28 × 498,020
  4. Step 4: Simplify right side
    921,956x = 633,630,487,425.60
  5. Step 5: Solve for x
    x = 633,630,487,425.60/921,956
  6. Step 6: Final answer
    x = 687,267.60

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.