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Finding the Fourth Proportional to 1,072,240.80, 1,606,978.80 and 821,680.80

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Solution

The fourth proportional to 1,072,240.80, 1,606,978.80 and 821,680.80 is: 1,231,461.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,072,240.80 : 1,606,978.80 = 821,680.80 : x
  2. Step 2: Convert to fraction form
    1,072,240.80/1,606,978.80 = 821,680.80/x
  3. Step 3: Cross multiply
    1,072,240.80x = 1,606,978.80 × 821,680.80
  4. Step 4: Simplify right side
    1,072,240.80x = 1,320,423,625,967.04
  5. Step 5: Solve for x
    x = 1,320,423,625,967.04/1,072,240.80
  6. Step 6: Final answer
    x = 1,231,461.84

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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.