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Finding the Fourth Proportional to 917.92, 1,377.03 and 455.71

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Solution

The fourth proportional to 917.92, 1,377.03 and 455.71 is: 683.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.92 : 1,377.03 = 455.71 : x
  2. Step 2: Convert to fraction form
    917.92/1,377.03 = 455.71/x
  3. Step 3: Cross multiply
    917.92x = 1,377.03 × 455.71
  4. Step 4: Simplify right side
    917.92x = 627,526.34
  5. Step 5: Solve for x
    x = 627,526.34/917.92
  6. Step 6: Final answer
    x = 683.64

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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.