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Finding the Fourth Proportional to 861.50, 1,292.76 and 399.44

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Solution

The fourth proportional to 861.50, 1,292.76 and 399.44 is: 599.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.50 : 1,292.76 = 399.44 : x
  2. Step 2: Convert to fraction form
    861.50/1,292.76 = 399.44/x
  3. Step 3: Cross multiply
    861.50x = 1,292.76 × 399.44
  4. Step 4: Simplify right side
    861.50x = 516,372.51
  5. Step 5: Solve for x
    x = 516,372.51/861.50
  6. Step 6: Final answer
    x = 599.39

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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.