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Finding the Fourth Proportional to 878.72, 1,318.38 and 618.10

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Solution

The fourth proportional to 878.72, 1,318.38 and 618.10 is: 927.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.72 : 1,318.38 = 618.10 : x
  2. Step 2: Convert to fraction form
    878.72/1,318.38 = 618.10/x
  3. Step 3: Cross multiply
    878.72x = 1,318.38 × 618.10
  4. Step 4: Simplify right side
    878.72x = 814,885.06
  5. Step 5: Solve for x
    x = 814,885.06/878.72
  6. Step 6: Final answer
    x = 927.36

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1.5x scale

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.