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Finding the Fourth Proportional to 878.76, 1,316.70 and 621

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Solution

The fourth proportional to 878.76, 1,316.70 and 621 is: 930.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.76 : 1,316.70 = 621 : x
  2. Step 2: Convert to fraction form
    878.76/1,316.70 = 621/x
  3. Step 3: Cross multiply
    878.76x = 1,316.70 × 621
  4. Step 4: Simplify right side
    878.76x = 817,670.70
  5. Step 5: Solve for x
    x = 817,670.70/878.76
  6. Step 6: Final answer
    x = 930.48

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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.