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Finding the Fourth Proportional to 877.53, 1,315.89 and 492.78

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Solution

The fourth proportional to 877.53, 1,315.89 and 492.78 is: 738.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.53 : 1,315.89 = 492.78 : x
  2. Step 2: Convert to fraction form
    877.53/1,315.89 = 492.78/x
  3. Step 3: Cross multiply
    877.53x = 1,315.89 × 492.78
  4. Step 4: Simplify right side
    877.53x = 648,444.27
  5. Step 5: Solve for x
    x = 648,444.27/877.53
  6. Step 6: Final answer
    x = 738.94

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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.