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Finding the Fourth Proportional to 918.96, 1,374.95 and 508.41

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Solution

The fourth proportional to 918.96, 1,374.95 and 508.41 is: 760.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.96 : 1,374.95 = 508.41 : x
  2. Step 2: Convert to fraction form
    918.96/1,374.95 = 508.41/x
  3. Step 3: Cross multiply
    918.96x = 1,374.95 × 508.41
  4. Step 4: Simplify right side
    918.96x = 699,035.79
  5. Step 5: Solve for x
    x = 699,035.79/918.96
  6. Step 6: Final answer
    x = 760.68

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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.