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Finding the Fourth Proportional to 978.31, 1,350.06 and 536.21

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Solution

The fourth proportional to 978.31, 1,350.06 and 536.21 is: 739.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.31 : 1,350.06 = 536.21 : x
  2. Step 2: Convert to fraction form
    978.31/1,350.06 = 536.21/x
  3. Step 3: Cross multiply
    978.31x = 1,350.06 × 536.21
  4. Step 4: Simplify right side
    978.31x = 723,915.67
  5. Step 5: Solve for x
    x = 723,915.67/978.31
  6. Step 6: Final answer
    x = 739.97

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.