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Finding the Fourth Proportional to 85,420.44, 128,117.53 and 28,495.36

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Solution

The fourth proportional to 85,420.44, 128,117.53 and 28,495.36 is: 42,738.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,420.44 : 128,117.53 = 28,495.36 : x
  2. Step 2: Convert to fraction form
    85,420.44/128,117.53 = 28,495.36/x
  3. Step 3: Cross multiply
    85,420.44x = 128,117.53 × 28,495.36
  4. Step 4: Simplify right side
    85,420.44x = 3,650,755,335.43
  5. Step 5: Solve for x
    x = 3,650,755,335.43/85,420.44
  6. Step 6: Final answer
    x = 42,738.66

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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.