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Finding the Fourth Proportional to 719.78, 1,079.72 and 281.00

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Solution

The fourth proportional to 719.78, 1,079.72 and 281.00 is: 421.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.78 : 1,079.72 = 281.00 : x
  2. Step 2: Convert to fraction form
    719.78/1,079.72 = 281.00/x
  3. Step 3: Cross multiply
    719.78x = 1,079.72 × 281.00
  4. Step 4: Simplify right side
    719.78x = 303,402.61
  5. Step 5: Solve for x
    x = 303,402.61/719.78
  6. Step 6: Final answer
    x = 421.52

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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.