Home / 285,540.15-428,146.20-85,830.60

Finding the Fourth Proportional to 285,540.15, 428,146.20 and 85,830.60

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Solution

The fourth proportional to 285,540.15, 428,146.20 and 85,830.60 is: 128,696.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,540.15 : 428,146.20 = 85,830.60 : x
  2. Step 2: Convert to fraction form
    285,540.15/428,146.20 = 85,830.60/x
  3. Step 3: Cross multiply
    285,540.15x = 428,146.20 × 85,830.60
  4. Step 4: Simplify right side
    285,540.15x = 36,748,045,233.72
  5. Step 5: Solve for x
    x = 36,748,045,233.72/285,540.15
  6. Step 6: Final answer
    x = 128,696.60

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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.