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Finding the Fourth Proportional to 876.74, 1,315.76 and 615.02

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Solution

The fourth proportional to 876.74, 1,315.76 and 615.02 is: 922.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.74 : 1,315.76 = 615.02 : x
  2. Step 2: Convert to fraction form
    876.74/1,315.76 = 615.02/x
  3. Step 3: Cross multiply
    876.74x = 1,315.76 × 615.02
  4. Step 4: Simplify right side
    876.74x = 809,209.06
  5. Step 5: Solve for x
    x = 809,209.06/876.74
  6. Step 6: Final answer
    x = 922.98

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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.