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Finding the Fourth Proportional to 1,319,204.80, 1,979,728.80 and 571,787.20

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Solution

The fourth proportional to 1,319,204.80, 1,979,728.80 and 571,787.20 is: 858,080.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319,204.80 : 1,979,728.80 = 571,787.20 : x
  2. Step 2: Convert to fraction form
    1,319,204.80/1,979,728.80 = 571,787.20/x
  3. Step 3: Cross multiply
    1,319,204.80x = 1,979,728.80 × 571,787.20
  4. Step 4: Simplify right side
    1,319,204.80x = 1,131,983,587,311.36
  5. Step 5: Solve for x
    x = 1,131,983,587,311.36/1,319,204.80
  6. Step 6: Final answer
    x = 858,080.25

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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.