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Finding the Fourth Proportional to 978.27, 1,349.79 and 887.51

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Solution

The fourth proportional to 978.27, 1,349.79 and 887.51 is: 1,224.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.27 : 1,349.79 = 887.51 : x
  2. Step 2: Convert to fraction form
    978.27/1,349.79 = 887.51/x
  3. Step 3: Cross multiply
    978.27x = 1,349.79 × 887.51
  4. Step 4: Simplify right side
    978.27x = 1,197,952.12
  5. Step 5: Solve for x
    x = 1,197,952.12/978.27
  6. Step 6: Final answer
    x = 1,224.56

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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.