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Finding the Fourth Proportional to 935.63, 1,291.20 and 542.78

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Solution

The fourth proportional to 935.63, 1,291.20 and 542.78 is: 749.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.63 : 1,291.20 = 542.78 : x
  2. Step 2: Convert to fraction form
    935.63/1,291.20 = 542.78/x
  3. Step 3: Cross multiply
    935.63x = 1,291.20 × 542.78
  4. Step 4: Simplify right side
    935.63x = 700,837.54
  5. Step 5: Solve for x
    x = 700,837.54/935.63
  6. Step 6: Final answer
    x = 749.05

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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.