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Finding the Fourth Proportional to 1,135.50, 1,566.96 and 638.20

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Solution

The fourth proportional to 1,135.50, 1,566.96 and 638.20 is: 880.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,135.50 : 1,566.96 = 638.20 : x
  2. Step 2: Convert to fraction form
    1,135.50/1,566.96 = 638.20/x
  3. Step 3: Cross multiply
    1,135.50x = 1,566.96 × 638.20
  4. Step 4: Simplify right side
    1,135.50x = 1,000,033.87
  5. Step 5: Solve for x
    x = 1,000,033.87/1,135.50
  6. Step 6: Final answer
    x = 880.70

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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.