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Finding the Fourth Proportional to 861.06, 1,291.68 and 283.98

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Solution

The fourth proportional to 861.06, 1,291.68 and 283.98 is: 426.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.06 : 1,291.68 = 283.98 : x
  2. Step 2: Convert to fraction form
    861.06/1,291.68 = 283.98/x
  3. Step 3: Cross multiply
    861.06x = 1,291.68 × 283.98
  4. Step 4: Simplify right side
    861.06x = 366,811.29
  5. Step 5: Solve for x
    x = 366,811.29/861.06
  6. Step 6: Final answer
    x = 426.00

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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.