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Finding the Fourth Proportional to 935.78, 1,291.59 and 543.02

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Solution

The fourth proportional to 935.78, 1,291.59 and 543.02 is: 749.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.78 : 1,291.59 = 543.02 : x
  2. Step 2: Convert to fraction form
    935.78/1,291.59 = 543.02/x
  3. Step 3: Cross multiply
    935.78x = 1,291.59 × 543.02
  4. Step 4: Simplify right side
    935.78x = 701,359.20
  5. Step 5: Solve for x
    x = 701,359.20/935.78
  6. Step 6: Final answer
    x = 749.49

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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.