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Finding the Fourth Proportional to 719.49, 1,078.65 and 372.88

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Solution

The fourth proportional to 719.49, 1,078.65 and 372.88 is: 559.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.49 : 1,078.65 = 372.88 : x
  2. Step 2: Convert to fraction form
    719.49/1,078.65 = 372.88/x
  3. Step 3: Cross multiply
    719.49x = 1,078.65 × 372.88
  4. Step 4: Simplify right side
    719.49x = 402,207.01
  5. Step 5: Solve for x
    x = 402,207.01/719.49
  6. Step 6: Final answer
    x = 559.02

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1.5x scale

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.