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Finding the Fourth Proportional to 710.74, 1,065.36 and 398.30

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Solution

The fourth proportional to 710.74, 1,065.36 and 398.30 is: 597.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.74 : 1,065.36 = 398.30 : x
  2. Step 2: Convert to fraction form
    710.74/1,065.36 = 398.30/x
  3. Step 3: Cross multiply
    710.74x = 1,065.36 × 398.30
  4. Step 4: Simplify right side
    710.74x = 424,332.89
  5. Step 5: Solve for x
    x = 424,332.89/710.74
  6. Step 6: Final answer
    x = 597.03

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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.