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Finding the Fourth Proportional to 841.76, 1,161.28 and 531.20

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Solution

The fourth proportional to 841.76, 1,161.28 and 531.20 is: 732.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.76 : 1,161.28 = 531.20 : x
  2. Step 2: Convert to fraction form
    841.76/1,161.28 = 531.20/x
  3. Step 3: Cross multiply
    841.76x = 1,161.28 × 531.20
  4. Step 4: Simplify right side
    841.76x = 616,871.94
  5. Step 5: Solve for x
    x = 616,871.94/841.76
  6. Step 6: Final answer
    x = 732.84

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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.