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Finding the Fourth Proportional to 285,310.10, 427,987.02 and 85,615.94

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Solution

The fourth proportional to 285,310.10, 427,987.02 and 85,615.94 is: 128,430.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,310.10 : 427,987.02 = 85,615.94 : x
  2. Step 2: Convert to fraction form
    285,310.10/427,987.02 = 85,615.94/x
  3. Step 3: Cross multiply
    285,310.10x = 427,987.02 × 85,615.94
  4. Step 4: Simplify right side
    285,310.10x = 36,642,511,025.10
  5. Step 5: Solve for x
    x = 36,642,511,025.10/285,310.10
  6. Step 6: Final answer
    x = 128,430.47

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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.