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Finding the Fourth Proportional to 715.88, 1,074.12 and 485.64

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Solution

The fourth proportional to 715.88, 1,074.12 and 485.64 is: 728.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.88 : 1,074.12 = 485.64 : x
  2. Step 2: Convert to fraction form
    715.88/1,074.12 = 485.64/x
  3. Step 3: Cross multiply
    715.88x = 1,074.12 × 485.64
  4. Step 4: Simplify right side
    715.88x = 521,635.64
  5. Step 5: Solve for x
    x = 521,635.64/715.88
  6. Step 6: Final answer
    x = 728.66

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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.