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Finding the Fourth Proportional to 1,135.74, 1,567.38 and 638.40

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Solution

The fourth proportional to 1,135.74, 1,567.38 and 638.40 is: 881.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,135.74 : 1,567.38 = 638.40 : x
  2. Step 2: Convert to fraction form
    1,135.74/1,567.38 = 638.40/x
  3. Step 3: Cross multiply
    1,135.74x = 1,567.38 × 638.40
  4. Step 4: Simplify right side
    1,135.74x = 1,000,615.39
  5. Step 5: Solve for x
    x = 1,000,615.39/1,135.74
  6. Step 6: Final answer
    x = 881.03

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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.