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Finding the Fourth Proportional to 877.76, 1,315.94 and 487.89

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Solution

The fourth proportional to 877.76, 1,315.94 and 487.89 is: 731.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.76 : 1,315.94 = 487.89 : x
  2. Step 2: Convert to fraction form
    877.76/1,315.94 = 487.89/x
  3. Step 3: Cross multiply
    877.76x = 1,315.94 × 487.89
  4. Step 4: Simplify right side
    877.76x = 642,031.53
  5. Step 5: Solve for x
    x = 642,031.53/877.76
  6. Step 6: Final answer
    x = 731.45

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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.