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Finding the Fourth Proportional to 1,010.87, 1,395.50 and 638.43

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Solution

The fourth proportional to 1,010.87, 1,395.50 and 638.43 is: 881.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,010.87 : 1,395.50 = 638.43 : x
  2. Step 2: Convert to fraction form
    1,010.87/1,395.50 = 638.43/x
  3. Step 3: Cross multiply
    1,010.87x = 1,395.50 × 638.43
  4. Step 4: Simplify right side
    1,010.87x = 890,920.64
  5. Step 5: Solve for x
    x = 890,920.64/1,010.87
  6. Step 6: Final answer
    x = 881.34

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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.