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Finding the Fourth Proportional to 391,411.75, 540,148.58 and 212,563.75

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Solution

The fourth proportional to 391,411.75, 540,148.58 and 212,563.75 is: 293,338.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,411.75 : 540,148.58 = 212,563.75 : x
  2. Step 2: Convert to fraction form
    391,411.75/540,148.58 = 212,563.75/x
  3. Step 3: Cross multiply
    391,411.75x = 540,148.58 × 212,563.75
  4. Step 4: Simplify right side
    391,411.75x = 114,816,007,721.98
  5. Step 5: Solve for x
    x = 114,816,007,721.98/391,411.75
  6. Step 6: Final answer
    x = 293,338.17

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.