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Finding the Fourth Proportional to 1,351.40, 1,862.75 and 978.40

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Solution

The fourth proportional to 1,351.40, 1,862.75 and 978.40 is: 1,348.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,351.40 : 1,862.75 = 978.40 : x
  2. Step 2: Convert to fraction form
    1,351.40/1,862.75 = 978.40/x
  3. Step 3: Cross multiply
    1,351.40x = 1,862.75 × 978.40
  4. Step 4: Simplify right side
    1,351.40x = 1,822,500.39
  5. Step 5: Solve for x
    x = 1,822,500.39/1,351.40
  6. Step 6: Final answer
    x = 1,348.60

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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.