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Finding the Fourth Proportional to 542.64, 808.90 and 511.28

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Solution

The fourth proportional to 542.64, 808.90 and 511.28 is: 762.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.64 : 808.90 = 511.28 : x
  2. Step 2: Convert to fraction form
    542.64/808.90 = 511.28/x
  3. Step 3: Cross multiply
    542.64x = 808.90 × 511.28
  4. Step 4: Simplify right side
    542.64x = 413,574.39
  5. Step 5: Solve for x
    x = 413,574.39/542.64
  6. Step 6: Final answer
    x = 762.15

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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.