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Finding the Fourth Proportional to 431,391.40, 647,106.30 and 147,077.80

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Solution

The fourth proportional to 431,391.40, 647,106.30 and 147,077.80 is: 220,623.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,391.40 : 647,106.30 = 147,077.80 : x
  2. Step 2: Convert to fraction form
    431,391.40/647,106.30 = 147,077.80/x
  3. Step 3: Cross multiply
    431,391.40x = 647,106.30 × 147,077.80
  4. Step 4: Simplify right side
    431,391.40x = 95,174,970,970.14
  5. Step 5: Solve for x
    x = 95,174,970,970.14/431,391.40
  6. Step 6: Final answer
    x = 220,623.25

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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.