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Finding the Fourth Proportional to 841.20, 1,161.17 and 621.91

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Solution

The fourth proportional to 841.20, 1,161.17 and 621.91 is: 858.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.20 : 1,161.17 = 621.91 : x
  2. Step 2: Convert to fraction form
    841.20/1,161.17 = 621.91/x
  3. Step 3: Cross multiply
    841.20x = 1,161.17 × 621.91
  4. Step 4: Simplify right side
    841.20x = 722,143.23
  5. Step 5: Solve for x
    x = 722,143.23/841.20
  6. Step 6: Final answer
    x = 858.47

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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.