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Finding the Fourth Proportional to 978.21, 1,350.11 and 585.27

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Solution

The fourth proportional to 978.21, 1,350.11 and 585.27 is: 807.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.21 : 1,350.11 = 585.27 : x
  2. Step 2: Convert to fraction form
    978.21/1,350.11 = 585.27/x
  3. Step 3: Cross multiply
    978.21x = 1,350.11 × 585.27
  4. Step 4: Simplify right side
    978.21x = 790,178.88
  5. Step 5: Solve for x
    x = 790,178.88/978.21
  6. Step 6: Final answer
    x = 807.78

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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.