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Finding the Fourth Proportional to 1,135.80, 1,567.57 and 638.48

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Solution

The fourth proportional to 1,135.80, 1,567.57 and 638.48 is: 881.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,135.80 : 1,567.57 = 638.48 : x
  2. Step 2: Convert to fraction form
    1,135.80/1,567.57 = 638.48/x
  3. Step 3: Cross multiply
    1,135.80x = 1,567.57 × 638.48
  4. Step 4: Simplify right side
    1,135.80x = 1,000,864.42
  5. Step 5: Solve for x
    x = 1,000,864.42/1,135.80
  6. Step 6: Final answer
    x = 881.20

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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.