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Finding the Fourth Proportional to 861.93, 1,292.90 and 618.93

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Solution

The fourth proportional to 861.93, 1,292.90 and 618.93 is: 928.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.93 : 1,292.90 = 618.93 : x
  2. Step 2: Convert to fraction form
    861.93/1,292.90 = 618.93/x
  3. Step 3: Cross multiply
    861.93x = 1,292.90 × 618.93
  4. Step 4: Simplify right side
    861.93x = 800,214.60
  5. Step 5: Solve for x
    x = 800,214.60/861.93
  6. Step 6: Final answer
    x = 928.40

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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.