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Finding the Fourth Proportional to 1,260,728.02, 1,739,808.76 and 687,780.20

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Solution

The fourth proportional to 1,260,728.02, 1,739,808.76 and 687,780.20 is: 949,138.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,260,728.02 : 1,739,808.76 = 687,780.20 : x
  2. Step 2: Convert to fraction form
    1,260,728.02/1,739,808.76 = 687,780.20/x
  3. Step 3: Cross multiply
    1,260,728.02x = 1,739,808.76 × 687,780.20
  4. Step 4: Simplify right side
    1,260,728.02x = 1,196,606,016,914.55
  5. Step 5: Solve for x
    x = 1,196,606,016,914.55/1,260,728.02
  6. Step 6: Final answer
    x = 949,138.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.