Home / 1,425,871.20-2,138,612.40-428,599.20

Finding the Fourth Proportional to 1,425,871.20, 2,138,612.40 and 428,599.20

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Solution

The fourth proportional to 1,425,871.20, 2,138,612.40 and 428,599.20 is: 642,840.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,425,871.20 : 2,138,612.40 = 428,599.20 : x
  2. Step 2: Convert to fraction form
    1,425,871.20/2,138,612.40 = 428,599.20/x
  3. Step 3: Cross multiply
    1,425,871.20x = 2,138,612.40 × 428,599.20
  4. Step 4: Simplify right side
    1,425,871.20x = 916,607,563,750.08
  5. Step 5: Solve for x
    x = 916,607,563,750.08/1,425,871.20
  6. Step 6: Final answer
    x = 642,840.37

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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.