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Finding the Fourth Proportional to 861.84, 1,291.86 and 374.76

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Solution

The fourth proportional to 861.84, 1,291.86 and 374.76 is: 561.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.84 : 1,291.86 = 374.76 : x
  2. Step 2: Convert to fraction form
    861.84/1,291.86 = 374.76/x
  3. Step 3: Cross multiply
    861.84x = 1,291.86 × 374.76
  4. Step 4: Simplify right side
    861.84x = 484,137.45
  5. Step 5: Solve for x
    x = 484,137.45/861.84
  6. Step 6: Final answer
    x = 561.75

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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.