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Finding the Fourth Proportional to 457,814.60, 686,721.90 and 308,515.40

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Solution

The fourth proportional to 457,814.60, 686,721.90 and 308,515.40 is: 462,773.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    457,814.60 : 686,721.90 = 308,515.40 : x
  2. Step 2: Convert to fraction form
    457,814.60/686,721.90 = 308,515.40/x
  3. Step 3: Cross multiply
    457,814.60x = 686,721.90 × 308,515.40
  4. Step 4: Simplify right side
    457,814.60x = 211,864,281,667.26
  5. Step 5: Solve for x
    x = 211,864,281,667.26/457,814.60
  6. Step 6: Final answer
    x = 462,773.10

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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.