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Finding the Fourth Proportional to 878.80, 1,316.90 and 384.75

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Solution

The fourth proportional to 878.80, 1,316.90 and 384.75 is: 576.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.80 : 1,316.90 = 384.75 : x
  2. Step 2: Convert to fraction form
    878.80/1,316.90 = 384.75/x
  3. Step 3: Cross multiply
    878.80x = 1,316.90 × 384.75
  4. Step 4: Simplify right side
    878.80x = 506,678.92
  5. Step 5: Solve for x
    x = 506,678.92/878.80
  6. Step 6: Final answer
    x = 576.56

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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.