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Finding the Fourth Proportional to 935.70, 1,291.59 and 641.94

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Solution

The fourth proportional to 935.70, 1,291.59 and 641.94 is: 886.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.70 : 1,291.59 = 641.94 : x
  2. Step 2: Convert to fraction form
    935.70/1,291.59 = 641.94/x
  3. Step 3: Cross multiply
    935.70x = 1,291.59 × 641.94
  4. Step 4: Simplify right side
    935.70x = 829,123.28
  5. Step 5: Solve for x
    x = 829,123.28/935.70
  6. Step 6: Final answer
    x = 886.10

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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.