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Finding the Fourth Proportional to 878.12, 1,310.28 and 848.40

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Solution

The fourth proportional to 878.12, 1,310.28 and 848.40 is: 1,265.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.12 : 1,310.28 = 848.40 : x
  2. Step 2: Convert to fraction form
    878.12/1,310.28 = 848.40/x
  3. Step 3: Cross multiply
    878.12x = 1,310.28 × 848.40
  4. Step 4: Simplify right side
    878.12x = 1,111,644.30
  5. Step 5: Solve for x
    x = 1,111,644.30/878.12
  6. Step 6: Final answer
    x = 1,265.93

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.