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Finding the Fourth Proportional to 1,225.92, 1,690.08 and 978.08

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Solution

The fourth proportional to 1,225.92, 1,690.08 and 978.08 is: 1,348.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,225.92 : 1,690.08 = 978.08 : x
  2. Step 2: Convert to fraction form
    1,225.92/1,690.08 = 978.08/x
  3. Step 3: Cross multiply
    1,225.92x = 1,690.08 × 978.08
  4. Step 4: Simplify right side
    1,225.92x = 1,653,033.45
  5. Step 5: Solve for x
    x = 1,653,033.45/1,225.92
  6. Step 6: Final answer
    x = 1,348.40

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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.