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Finding the Fourth Proportional to 704.28, 1,054.86 and 487.20

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Solution

The fourth proportional to 704.28, 1,054.86 and 487.20 is: 729.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    704.28 : 1,054.86 = 487.20 : x
  2. Step 2: Convert to fraction form
    704.28/1,054.86 = 487.20/x
  3. Step 3: Cross multiply
    704.28x = 1,054.86 × 487.20
  4. Step 4: Simplify right side
    704.28x = 513,927.79
  5. Step 5: Solve for x
    x = 513,927.79/704.28
  6. Step 6: Final answer
    x = 729.72

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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.