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Finding the Fourth Proportional to 1,021.66, 1,412.49 and 978.13

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Solution

The fourth proportional to 1,021.66, 1,412.49 and 978.13 is: 1,352.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.66 : 1,412.49 = 978.13 : x
  2. Step 2: Convert to fraction form
    1,021.66/1,412.49 = 978.13/x
  3. Step 3: Cross multiply
    1,021.66x = 1,412.49 × 978.13
  4. Step 4: Simplify right side
    1,021.66x = 1,381,590.83
  5. Step 5: Solve for x
    x = 1,381,590.83/1,021.66
  6. Step 6: Final answer
    x = 1,352.30

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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.