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Finding the Fourth Proportional to 879,172.16, 1,318,685.28 and 280,109.12

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Solution

The fourth proportional to 879,172.16, 1,318,685.28 and 280,109.12 is: 420,140.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    879,172.16 : 1,318,685.28 = 280,109.12 : x
  2. Step 2: Convert to fraction form
    879,172.16/1,318,685.28 = 280,109.12/x
  3. Step 3: Cross multiply
    879,172.16x = 1,318,685.28 × 280,109.12
  4. Step 4: Simplify right side
    879,172.16x = 369,375,773,337.75
  5. Step 5: Solve for x
    x = 369,375,773,337.75/879,172.16
  6. Step 6: Final answer
    x = 420,140.43

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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.