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Finding the Fourth Proportional to 642,080.78, 886,071.11 and 355,600.59

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Solution

The fourth proportional to 642,080.78, 886,071.11 and 355,600.59 is: 490,728.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,080.78 : 886,071.11 = 355,600.59 : x
  2. Step 2: Convert to fraction form
    642,080.78/886,071.11 = 355,600.59/x
  3. Step 3: Cross multiply
    642,080.78x = 886,071.11 × 355,600.59
  4. Step 4: Simplify right side
    642,080.78x = 315,087,407,719.95
  5. Step 5: Solve for x
    x = 315,087,407,719.95/642,080.78
  6. Step 6: Final answer
    x = 490,728.61

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1.5x scale

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.