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Finding the Fourth Proportional to 876.62, 1,315.72 and 783.92

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Solution

The fourth proportional to 876.62, 1,315.72 and 783.92 is: 1,176.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.62 : 1,315.72 = 783.92 : x
  2. Step 2: Convert to fraction form
    876.62/1,315.72 = 783.92/x
  3. Step 3: Cross multiply
    876.62x = 1,315.72 × 783.92
  4. Step 4: Simplify right side
    876.62x = 1,031,419.22
  5. Step 5: Solve for x
    x = 1,031,419.22/876.62
  6. Step 6: Final answer
    x = 1,176.59

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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.