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Finding the Fourth Proportional to 861.04, 1,188.10 and 487.88

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Solution

The fourth proportional to 861.04, 1,188.10 and 487.88 is: 673.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.04 : 1,188.10 = 487.88 : x
  2. Step 2: Convert to fraction form
    861.04/1,188.10 = 487.88/x
  3. Step 3: Cross multiply
    861.04x = 1,188.10 × 487.88
  4. Step 4: Simplify right side
    861.04x = 579,650.23
  5. Step 5: Solve for x
    x = 579,650.23/861.04
  6. Step 6: Final answer
    x = 673.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.