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Finding the Fourth Proportional to 660,428.20, 990,642.30 and 344,811.70

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Solution

The fourth proportional to 660,428.20, 990,642.30 and 344,811.70 is: 517,217.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,428.20 : 990,642.30 = 344,811.70 : x
  2. Step 2: Convert to fraction form
    660,428.20/990,642.30 = 344,811.70/x
  3. Step 3: Cross multiply
    660,428.20x = 990,642.30 × 344,811.70
  4. Step 4: Simplify right side
    660,428.20x = 341,585,055,554.91
  5. Step 5: Solve for x
    x = 341,585,055,554.91/660,428.20
  6. Step 6: Final answer
    x = 517,217.55

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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.