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Finding the Fourth Proportional to 420,907.20, 631,360.80 and 420,907.20

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Solution

The fourth proportional to 420,907.20, 631,360.80 and 420,907.20 is: 631,360.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,907.20 : 631,360.80 = 420,907.20 : x
  2. Step 2: Convert to fraction form
    420,907.20/631,360.80 = 420,907.20/x
  3. Step 3: Cross multiply
    420,907.20x = 631,360.80 × 420,907.20
  4. Step 4: Simplify right side
    420,907.20x = 265,744,306,517.76
  5. Step 5: Solve for x
    x = 265,744,306,517.76/420,907.20
  6. Step 6: Final answer
    x = 631,360.80

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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.