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Finding the Fourth Proportional to 1,287,649.20, 1,929,821.40 and 719,029.20

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Solution

The fourth proportional to 1,287,649.20, 1,929,821.40 and 719,029.20 is: 1,077,621.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287,649.20 : 1,929,821.40 = 719,029.20 : x
  2. Step 2: Convert to fraction form
    1,287,649.20/1,929,821.40 = 719,029.20/x
  3. Step 3: Cross multiply
    1,287,649.20x = 1,929,821.40 × 719,029.20
  4. Step 4: Simplify right side
    1,287,649.20x = 1,387,597,937,384.88
  5. Step 5: Solve for x
    x = 1,387,597,937,384.88/1,287,649.20
  6. Step 6: Final answer
    x = 1,077,621.09

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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.