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Finding the Fourth Proportional to 861.79, 1,292.89 and 245.50

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Solution

The fourth proportional to 861.79, 1,292.89 and 245.50 is: 368.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.79 : 1,292.89 = 245.50 : x
  2. Step 2: Convert to fraction form
    861.79/1,292.89 = 245.50/x
  3. Step 3: Cross multiply
    861.79x = 1,292.89 × 245.50
  4. Step 4: Simplify right side
    861.79x = 317,406.13
  5. Step 5: Solve for x
    x = 317,406.13/861.79
  6. Step 6: Final answer
    x = 368.31

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Double scale
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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.