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Finding the Fourth Proportional to 787.96, 1,085.04 and 749.08

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Solution

The fourth proportional to 787.96, 1,085.04 and 749.08 is: 1,031.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.96 : 1,085.04 = 749.08 : x
  2. Step 2: Convert to fraction form
    787.96/1,085.04 = 749.08/x
  3. Step 3: Cross multiply
    787.96x = 1,085.04 × 749.08
  4. Step 4: Simplify right side
    787.96x = 812,781.76
  5. Step 5: Solve for x
    x = 812,781.76/787.96
  6. Step 6: Final answer
    x = 1,031.50

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.