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Finding the Fourth Proportional to 979.60, 1,353.39 and 901.84

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Solution

The fourth proportional to 979.60, 1,353.39 and 901.84 is: 1,245.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.60 : 1,353.39 = 901.84 : x
  2. Step 2: Convert to fraction form
    979.60/1,353.39 = 901.84/x
  3. Step 3: Cross multiply
    979.60x = 1,353.39 × 901.84
  4. Step 4: Simplify right side
    979.60x = 1,220,541.24
  5. Step 5: Solve for x
    x = 1,220,541.24/979.60
  6. Step 6: Final answer
    x = 1,245.96

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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.