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Finding the Fourth Proportional to 417,981.20, 626,971.80 and 137,430.80

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Solution

The fourth proportional to 417,981.20, 626,971.80 and 137,430.80 is: 206,146.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    417,981.20 : 626,971.80 = 137,430.80 : x
  2. Step 2: Convert to fraction form
    417,981.20/626,971.80 = 137,430.80/x
  3. Step 3: Cross multiply
    417,981.20x = 626,971.80 × 137,430.80
  4. Step 4: Simplify right side
    417,981.20x = 86,165,236,051.44
  5. Step 5: Solve for x
    x = 86,165,236,051.44/417,981.20
  6. Step 6: Final answer
    x = 206,146.20

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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.