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Finding the Fourth Proportional to 642,575.80, 886,759.82 and 356,100.60

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Solution

The fourth proportional to 642,575.80, 886,759.82 and 356,100.60 is: 491,421.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,575.80 : 886,759.82 = 356,100.60 : x
  2. Step 2: Convert to fraction form
    642,575.80/886,759.82 = 356,100.60/x
  3. Step 3: Cross multiply
    642,575.80x = 886,759.82 × 356,100.60
  4. Step 4: Simplify right side
    642,575.80x = 315,775,703,957.89
  5. Step 5: Solve for x
    x = 315,775,703,957.89/642,575.80
  6. Step 6: Final answer
    x = 491,421.72

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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.