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Finding the Fourth Proportional to 480,007.80, 720,011.70 and 428,686.20

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Solution

The fourth proportional to 480,007.80, 720,011.70 and 428,686.20 is: 643,029.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    480,007.80 : 720,011.70 = 428,686.20 : x
  2. Step 2: Convert to fraction form
    480,007.80/720,011.70 = 428,686.20/x
  3. Step 3: Cross multiply
    480,007.80x = 720,011.70 × 428,686.20
  4. Step 4: Simplify right side
    480,007.80x = 308,659,079,628.54
  5. Step 5: Solve for x
    x = 308,659,079,628.54/480,007.80
  6. Step 6: Final answer
    x = 643,029.30

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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.