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Finding the Fourth Proportional to 715.89, 1,073.01 and 390.69

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Solution

The fourth proportional to 715.89, 1,073.01 and 390.69 is: 585.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.89 : 1,073.01 = 390.69 : x
  2. Step 2: Convert to fraction form
    715.89/1,073.01 = 390.69/x
  3. Step 3: Cross multiply
    715.89x = 1,073.01 × 390.69
  4. Step 4: Simplify right side
    715.89x = 419,214.28
  5. Step 5: Solve for x
    x = 419,214.28/715.89
  6. Step 6: Final answer
    x = 585.58

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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.