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Finding the Fourth Proportional to 1,321,672.80, 1,982,509.20 and 1,253,438.40

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Solution

The fourth proportional to 1,321,672.80, 1,982,509.20 and 1,253,438.40 is: 1,880,157.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321,672.80 : 1,982,509.20 = 1,253,438.40 : x
  2. Step 2: Convert to fraction form
    1,321,672.80/1,982,509.20 = 1,253,438.40/x
  3. Step 3: Cross multiply
    1,321,672.80x = 1,982,509.20 × 1,253,438.40
  4. Step 4: Simplify right side
    1,321,672.80x = 2,484,953,159,633.28
  5. Step 5: Solve for x
    x = 2,484,953,159,633.28/1,321,672.80
  6. Step 6: Final answer
    x = 1,880,157.60

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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.