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Finding the Fourth Proportional to 935.13, 1,291.55 and 639.88

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Solution

The fourth proportional to 935.13, 1,291.55 and 639.88 is: 883.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.13 : 1,291.55 = 639.88 : x
  2. Step 2: Convert to fraction form
    935.13/1,291.55 = 639.88/x
  3. Step 3: Cross multiply
    935.13x = 1,291.55 × 639.88
  4. Step 4: Simplify right side
    935.13x = 826,437.01
  5. Step 5: Solve for x
    x = 826,437.01/935.13
  6. Step 6: Final answer
    x = 883.77

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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.