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Finding the Fourth Proportional to 979.60, 1,350.60 and 647.50

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Solution

The fourth proportional to 979.60, 1,350.60 and 647.50 is: 892.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.60 : 1,350.60 = 647.50 : x
  2. Step 2: Convert to fraction form
    979.60/1,350.60 = 647.50/x
  3. Step 3: Cross multiply
    979.60x = 1,350.60 × 647.50
  4. Step 4: Simplify right side
    979.60x = 874,513.50
  5. Step 5: Solve for x
    x = 874,513.50/979.60
  6. Step 6: Final answer
    x = 892.73

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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.