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Finding the Fourth Proportional to 972.92, 1,459.38 and 485.48

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Solution

The fourth proportional to 972.92, 1,459.38 and 485.48 is: 728.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.92 : 1,459.38 = 485.48 : x
  2. Step 2: Convert to fraction form
    972.92/1,459.38 = 485.48/x
  3. Step 3: Cross multiply
    972.92x = 1,459.38 × 485.48
  4. Step 4: Simplify right side
    972.92x = 708,499.80
  5. Step 5: Solve for x
    x = 708,499.80/972.92
  6. Step 6: Final answer
    x = 728.22

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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.