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Finding the Fourth Proportional to 1,010.38, 1,392.84 and 869.88

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Solution

The fourth proportional to 1,010.38, 1,392.84 and 869.88 is: 1,199.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,010.38 : 1,392.84 = 869.88 : x
  2. Step 2: Convert to fraction form
    1,010.38/1,392.84 = 869.88/x
  3. Step 3: Cross multiply
    1,010.38x = 1,392.84 × 869.88
  4. Step 4: Simplify right side
    1,010.38x = 1,211,603.66
  5. Step 5: Solve for x
    x = 1,211,603.66/1,010.38
  6. Step 6: Final answer
    x = 1,199.16

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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.