Home / 820,100.80-1,230,151.20-687,390.40

Finding the Fourth Proportional to 820,100.80, 1,230,151.20 and 687,390.40

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Solution

The fourth proportional to 820,100.80, 1,230,151.20 and 687,390.40 is: 1,031,085.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    820,100.80 : 1,230,151.20 = 687,390.40 : x
  2. Step 2: Convert to fraction form
    820,100.80/1,230,151.20 = 687,390.40/x
  3. Step 3: Cross multiply
    820,100.80x = 1,230,151.20 × 687,390.40
  4. Step 4: Simplify right side
    820,100.80x = 845,594,125,428.48
  5. Step 5: Solve for x
    x = 845,594,125,428.48/820,100.80
  6. Step 6: Final answer
    x = 1,031,085.60

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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.