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Finding the Fourth Proportional to 391,639.80, 587,459.70 and 312,907.80

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Solution

The fourth proportional to 391,639.80, 587,459.70 and 312,907.80 is: 469,361.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,639.80 : 587,459.70 = 312,907.80 : x
  2. Step 2: Convert to fraction form
    391,639.80/587,459.70 = 312,907.80/x
  3. Step 3: Cross multiply
    391,639.80x = 587,459.70 × 312,907.80
  4. Step 4: Simplify right side
    391,639.80x = 183,820,722,315.66
  5. Step 5: Solve for x
    x = 183,820,722,315.66/391,639.80
  6. Step 6: Final answer
    x = 469,361.70

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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.