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Finding the Fourth Proportional to 1,010.64, 1,395.52 and 638.24

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Solution

The fourth proportional to 1,010.64, 1,395.52 and 638.24 is: 881.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,010.64 : 1,395.52 = 638.24 : x
  2. Step 2: Convert to fraction form
    1,010.64/1,395.52 = 638.24/x
  3. Step 3: Cross multiply
    1,010.64x = 1,395.52 × 638.24
  4. Step 4: Simplify right side
    1,010.64x = 890,676.68
  5. Step 5: Solve for x
    x = 890,676.68/1,010.64
  6. Step 6: Final answer
    x = 881.30

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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.