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Finding the Fourth Proportional to 945.84, 1,421.79 and 878.20

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Solution

The fourth proportional to 945.84, 1,421.79 and 878.20 is: 1,320.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    945.84 : 1,421.79 = 878.20 : x
  2. Step 2: Convert to fraction form
    945.84/1,421.79 = 878.20/x
  3. Step 3: Cross multiply
    945.84x = 1,421.79 × 878.20
  4. Step 4: Simplify right side
    945.84x = 1,248,615.98
  5. Step 5: Solve for x
    x = 1,248,615.98/945.84
  6. Step 6: Final answer
    x = 1,320.12

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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.