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Finding the Fourth Proportional to 841.50, 1,161.15 and 487.41

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Solution

The fourth proportional to 841.50, 1,161.15 and 487.41 is: 672.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.50 : 1,161.15 = 487.41 : x
  2. Step 2: Convert to fraction form
    841.50/1,161.15 = 487.41/x
  3. Step 3: Cross multiply
    841.50x = 1,161.15 × 487.41
  4. Step 4: Simplify right side
    841.50x = 565,956.12
  5. Step 5: Solve for x
    x = 565,956.12/841.50
  6. Step 6: Final answer
    x = 672.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.