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Finding the Fourth Proportional to 1,135.91, 1,567.50 and 638.57

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Solution

The fourth proportional to 1,135.91, 1,567.50 and 638.57 is: 881.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,135.91 : 1,567.50 = 638.57 : x
  2. Step 2: Convert to fraction form
    1,135.91/1,567.50 = 638.57/x
  3. Step 3: Cross multiply
    1,135.91x = 1,567.50 × 638.57
  4. Step 4: Simplify right side
    1,135.91x = 1,000,958.48
  5. Step 5: Solve for x
    x = 1,000,958.48/1,135.91
  6. Step 6: Final answer
    x = 881.20

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1.5x scale

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.