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Finding the Fourth Proportional to 917.73, 1,374.87 and 454.83

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Solution

The fourth proportional to 917.73, 1,374.87 and 454.83 is: 681.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.73 : 1,374.87 = 454.83 : x
  2. Step 2: Convert to fraction form
    917.73/1,374.87 = 454.83/x
  3. Step 3: Cross multiply
    917.73x = 1,374.87 × 454.83
  4. Step 4: Simplify right side
    917.73x = 625,332.12
  5. Step 5: Solve for x
    x = 625,332.12/917.73
  6. Step 6: Final answer
    x = 681.39

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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.