Home / 457,821.20-686,731.80-388,701.20

Finding the Fourth Proportional to 457,821.20, 686,731.80 and 388,701.20

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Solution

The fourth proportional to 457,821.20, 686,731.80 and 388,701.20 is: 583,051.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    457,821.20 : 686,731.80 = 388,701.20 : x
  2. Step 2: Convert to fraction form
    457,821.20/686,731.80 = 388,701.20/x
  3. Step 3: Cross multiply
    457,821.20x = 686,731.80 × 388,701.20
  4. Step 4: Simplify right side
    457,821.20x = 266,933,474,738.16
  5. Step 5: Solve for x
    x = 266,933,474,738.16/457,821.20
  6. Step 6: Final answer
    x = 583,051.80

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1.5x scale

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.