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Finding the Fourth Proportional to 841.61, 1,161.63 and 487.46

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Solution

The fourth proportional to 841.61, 1,161.63 and 487.46 is: 672.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.61 : 1,161.63 = 487.46 : x
  2. Step 2: Convert to fraction form
    841.61/1,161.63 = 487.46/x
  3. Step 3: Cross multiply
    841.61x = 1,161.63 × 487.46
  4. Step 4: Simplify right side
    841.61x = 566,242.35
  5. Step 5: Solve for x
    x = 566,242.35/841.61
  6. Step 6: Final answer
    x = 672.81

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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.