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Finding the Fourth Proportional to 935.78, 1,291.38 and 542.88

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Solution

The fourth proportional to 935.78, 1,291.38 and 542.88 is: 749.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.78 : 1,291.38 = 542.88 : x
  2. Step 2: Convert to fraction form
    935.78/1,291.38 = 542.88/x
  3. Step 3: Cross multiply
    935.78x = 1,291.38 × 542.88
  4. Step 4: Simplify right side
    935.78x = 701,064.37
  5. Step 5: Solve for x
    x = 701,064.37/935.78
  6. Step 6: Final answer
    x = 749.18

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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.