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Finding the Fourth Proportional to 972.52, 1,457.79 and 485.80

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Solution

The fourth proportional to 972.52, 1,457.79 and 485.80 is: 728.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.52 : 1,457.79 = 485.80 : x
  2. Step 2: Convert to fraction form
    972.52/1,457.79 = 485.80/x
  3. Step 3: Cross multiply
    972.52x = 1,457.79 × 485.80
  4. Step 4: Simplify right side
    972.52x = 708,194.38
  5. Step 5: Solve for x
    x = 708,194.38/972.52
  6. Step 6: Final answer
    x = 728.21

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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.