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Finding the Fourth Proportional to 1,599.50, 2,207.40 and 978.50

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Solution

The fourth proportional to 1,599.50, 2,207.40 and 978.50 is: 1,350.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,599.50 : 2,207.40 = 978.50 : x
  2. Step 2: Convert to fraction form
    1,599.50/2,207.40 = 978.50/x
  3. Step 3: Cross multiply
    1,599.50x = 2,207.40 × 978.50
  4. Step 4: Simplify right side
    1,599.50x = 2,159,940.90
  5. Step 5: Solve for x
    x = 2,159,940.90/1,599.50
  6. Step 6: Final answer
    x = 1,350.39

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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.