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Finding the Fourth Proportional to 1,398.85, 1,927.17 and 978.46

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Solution

The fourth proportional to 1,398.85, 1,927.17 and 978.46 is: 1,348.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398.85 : 1,927.17 = 978.46 : x
  2. Step 2: Convert to fraction form
    1,398.85/1,927.17 = 978.46/x
  3. Step 3: Cross multiply
    1,398.85x = 1,927.17 × 978.46
  4. Step 4: Simplify right side
    1,398.85x = 1,885,658.76
  5. Step 5: Solve for x
    x = 1,885,658.76/1,398.85
  6. Step 6: Final answer
    x = 1,348.01

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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.