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Finding the Fourth Proportional to 1,135.40, 1,566.90 and 638.10

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Solution

The fourth proportional to 1,135.40, 1,566.90 and 638.10 is: 880.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,135.40 : 1,566.90 = 638.10 : x
  2. Step 2: Convert to fraction form
    1,135.40/1,566.90 = 638.10/x
  3. Step 3: Cross multiply
    1,135.40x = 1,566.90 × 638.10
  4. Step 4: Simplify right side
    1,135.40x = 999,838.89
  5. Step 5: Solve for x
    x = 999,838.89/1,135.40
  6. Step 6: Final answer
    x = 880.61

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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.