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Finding the Fourth Proportional to 715.80, 1,074.02 and 390.76

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Solution

The fourth proportional to 715.80, 1,074.02 and 390.76 is: 586.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.80 : 1,074.02 = 390.76 : x
  2. Step 2: Convert to fraction form
    715.80/1,074.02 = 390.76/x
  3. Step 3: Cross multiply
    715.80x = 1,074.02 × 390.76
  4. Step 4: Simplify right side
    715.80x = 419,684.06
  5. Step 5: Solve for x
    x = 419,684.06/715.80
  6. Step 6: Final answer
    x = 586.31

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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.