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Finding the Fourth Proportional to 782.46, 1,174.45 and 417.50

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Solution

The fourth proportional to 782.46, 1,174.45 and 417.50 is: 626.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.46 : 1,174.45 = 417.50 : x
  2. Step 2: Convert to fraction form
    782.46/1,174.45 = 417.50/x
  3. Step 3: Cross multiply
    782.46x = 1,174.45 × 417.50
  4. Step 4: Simplify right side
    782.46x = 490,337.75
  5. Step 5: Solve for x
    x = 490,337.75/782.46
  6. Step 6: Final answer
    x = 626.66

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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.