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Finding the Fourth Proportional to 841.65, 1,161.78 and 487.74

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Solution

The fourth proportional to 841.65, 1,161.78 and 487.74 is: 673.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.65 : 1,161.78 = 487.74 : x
  2. Step 2: Convert to fraction form
    841.65/1,161.78 = 487.74/x
  3. Step 3: Cross multiply
    841.65x = 1,161.78 × 487.74
  4. Step 4: Simplify right side
    841.65x = 566,646.58
  5. Step 5: Solve for x
    x = 566,646.58/841.65
  6. Step 6: Final answer
    x = 673.26

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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.