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Finding the Fourth Proportional to 719.86, 1,079.56 and 354.90

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Solution

The fourth proportional to 719.86, 1,079.56 and 354.90 is: 532.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.86 : 1,079.56 = 354.90 : x
  2. Step 2: Convert to fraction form
    719.86/1,079.56 = 354.90/x
  3. Step 3: Cross multiply
    719.86x = 1,079.56 × 354.90
  4. Step 4: Simplify right side
    719.86x = 383,135.84
  5. Step 5: Solve for x
    x = 383,135.84/719.86
  6. Step 6: Final answer
    x = 532.24

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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.