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Finding the Fourth Proportional to 457,686.20, 686,529.30 and 388,566.20

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Solution

The fourth proportional to 457,686.20, 686,529.30 and 388,566.20 is: 582,849.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    457,686.20 : 686,529.30 = 388,566.20 : x
  2. Step 2: Convert to fraction form
    457,686.20/686,529.30 = 388,566.20/x
  3. Step 3: Cross multiply
    457,686.20x = 686,529.30 × 388,566.20
  4. Step 4: Simplify right side
    457,686.20x = 266,762,081,289.66
  5. Step 5: Solve for x
    x = 266,762,081,289.66/457,686.20
  6. Step 6: Final answer
    x = 582,849.30

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Double scale
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Similar ratio
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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.