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Finding the Fourth Proportional to 542.40, 810.51 and 411.68

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Solution

The fourth proportional to 542.40, 810.51 and 411.68 is: 615.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.40 : 810.51 = 411.68 : x
  2. Step 2: Convert to fraction form
    542.40/810.51 = 411.68/x
  3. Step 3: Cross multiply
    542.40x = 810.51 × 411.68
  4. Step 4: Simplify right side
    542.40x = 333,671.24
  5. Step 5: Solve for x
    x = 333,671.24/542.40
  6. Step 6: Final answer
    x = 615.18

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.