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Finding the Fourth Proportional to 1,009.40, 1,514.10 and 839.30

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Solution

The fourth proportional to 1,009.40, 1,514.10 and 839.30 is: 1,258.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.40 : 1,514.10 = 839.30 : x
  2. Step 2: Convert to fraction form
    1,009.40/1,514.10 = 839.30/x
  3. Step 3: Cross multiply
    1,009.40x = 1,514.10 × 839.30
  4. Step 4: Simplify right side
    1,009.40x = 1,270,784.13
  5. Step 5: Solve for x
    x = 1,270,784.13/1,009.40
  6. Step 6: Final answer
    x = 1,258.95

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.