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Finding the Fourth Proportional to 841.49, 1,161.42 and 487.45

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Solution

The fourth proportional to 841.49, 1,161.42 and 487.45 is: 672.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.49 : 1,161.42 = 487.45 : x
  2. Step 2: Convert to fraction form
    841.49/1,161.42 = 487.45/x
  3. Step 3: Cross multiply
    841.49x = 1,161.42 × 487.45
  4. Step 4: Simplify right side
    841.49x = 566,134.18
  5. Step 5: Solve for x
    x = 566,134.18/841.49
  6. Step 6: Final answer
    x = 672.78

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1.5x scale

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.