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Finding the Fourth Proportional to 876.31, 1,312.92 and 780.98

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Solution

The fourth proportional to 876.31, 1,312.92 and 780.98 is: 1,170.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.31 : 1,312.92 = 780.98 : x
  2. Step 2: Convert to fraction form
    876.31/1,312.92 = 780.98/x
  3. Step 3: Cross multiply
    876.31x = 1,312.92 × 780.98
  4. Step 4: Simplify right side
    876.31x = 1,025,364.26
  5. Step 5: Solve for x
    x = 1,025,364.26/876.31
  6. Step 6: Final answer
    x = 1,170.09

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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.