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Finding the Fourth Proportional to 876.76, 1,315.14 and 299.64

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Solution

The fourth proportional to 876.76, 1,315.14 and 299.64 is: 449.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.76 : 1,315.14 = 299.64 : x
  2. Step 2: Convert to fraction form
    876.76/1,315.14 = 299.64/x
  3. Step 3: Cross multiply
    876.76x = 1,315.14 × 299.64
  4. Step 4: Simplify right side
    876.76x = 394,068.55
  5. Step 5: Solve for x
    x = 394,068.55/876.76
  6. Step 6: Final answer
    x = 449.46

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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.