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Finding the Fourth Proportional to 1,135.95, 1,567.65 and 638.55

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Solution

The fourth proportional to 1,135.95, 1,567.65 and 638.55 is: 881.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,135.95 : 1,567.65 = 638.55 : x
  2. Step 2: Convert to fraction form
    1,135.95/1,567.65 = 638.55/x
  3. Step 3: Cross multiply
    1,135.95x = 1,567.65 × 638.55
  4. Step 4: Simplify right side
    1,135.95x = 1,001,022.91
  5. Step 5: Solve for x
    x = 1,001,022.91/1,135.95
  6. Step 6: Final answer
    x = 881.22

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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.