Home / 1,218,420-1,681,186.20-788,640.48

Finding the Fourth Proportional to 1,218,420, 1,681,186.20 and 788,640.48

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Solution

The fourth proportional to 1,218,420, 1,681,186.20 and 788,640.48 is: 1,088,172.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218,420 : 1,681,186.20 = 788,640.48 : x
  2. Step 2: Convert to fraction form
    1,218,420/1,681,186.20 = 788,640.48/x
  3. Step 3: Cross multiply
    1,218,420x = 1,681,186.20 × 788,640.48
  4. Step 4: Simplify right side
    1,218,420x = 1,325,851,491,737.38
  5. Step 5: Solve for x
    x = 1,325,851,491,737.38/1,218,420
  6. Step 6: Final answer
    x = 1,088,172.79

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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.