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Finding the Fourth Proportional to 715.24, 1,073.78 and 485.16

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Solution

The fourth proportional to 715.24, 1,073.78 and 485.16 is: 728.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.24 : 1,073.78 = 485.16 : x
  2. Step 2: Convert to fraction form
    715.24/1,073.78 = 485.16/x
  3. Step 3: Cross multiply
    715.24x = 1,073.78 × 485.16
  4. Step 4: Simplify right side
    715.24x = 520,955.10
  5. Step 5: Solve for x
    x = 520,955.10/715.24
  6. Step 6: Final answer
    x = 728.36

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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.