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Finding the Fourth Proportional to 391,718.40, 540,566.40 and 212,870.40

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Solution

The fourth proportional to 391,718.40, 540,566.40 and 212,870.40 is: 293,758.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,718.40 : 540,566.40 = 212,870.40 : x
  2. Step 2: Convert to fraction form
    391,718.40/540,566.40 = 212,870.40/x
  3. Step 3: Cross multiply
    391,718.40x = 540,566.40 × 212,870.40
  4. Step 4: Simplify right side
    391,718.40x = 115,070,585,794.56
  5. Step 5: Solve for x
    x = 115,070,585,794.56/391,718.40
  6. Step 6: Final answer
    x = 293,758.44

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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.