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Finding the Fourth Proportional to 787.04, 1,179.44 and 421.53

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Solution

The fourth proportional to 787.04, 1,179.44 and 421.53 is: 631.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.04 : 1,179.44 = 421.53 : x
  2. Step 2: Convert to fraction form
    787.04/1,179.44 = 421.53/x
  3. Step 3: Cross multiply
    787.04x = 1,179.44 × 421.53
  4. Step 4: Simplify right side
    787.04x = 497,169.34
  5. Step 5: Solve for x
    x = 497,169.34/787.04
  6. Step 6: Final answer
    x = 631.70

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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.