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Finding the Fourth Proportional to 542.68, 812.64 and 389.59

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Solution

The fourth proportional to 542.68, 812.64 and 389.59 is: 583.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.68 : 812.64 = 389.59 : x
  2. Step 2: Convert to fraction form
    542.68/812.64 = 389.59/x
  3. Step 3: Cross multiply
    542.68x = 812.64 × 389.59
  4. Step 4: Simplify right side
    542.68x = 316,596.42
  5. Step 5: Solve for x
    x = 316,596.42/542.68
  6. Step 6: Final answer
    x = 583.39

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.