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Finding the Fourth Proportional to 1,309.16, 1,962.72 and 724.40

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Solution

The fourth proportional to 1,309.16, 1,962.72 and 724.40 is: 1,086.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.16 : 1,962.72 = 724.40 : x
  2. Step 2: Convert to fraction form
    1,309.16/1,962.72 = 724.40/x
  3. Step 3: Cross multiply
    1,309.16x = 1,962.72 × 724.40
  4. Step 4: Simplify right side
    1,309.16x = 1,421,794.37
  5. Step 5: Solve for x
    x = 1,421,794.37/1,309.16
  6. Step 6: Final answer
    x = 1,086.04

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.