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Finding the Fourth Proportional to 84,489.36, 126,762.12 and 28,335

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Solution

The fourth proportional to 84,489.36, 126,762.12 and 28,335 is: 42,511.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,489.36 : 126,762.12 = 28,335 : x
  2. Step 2: Convert to fraction form
    84,489.36/126,762.12 = 28,335/x
  3. Step 3: Cross multiply
    84,489.36x = 126,762.12 × 28,335
  4. Step 4: Simplify right side
    84,489.36x = 3,591,804,670.20
  5. Step 5: Solve for x
    x = 3,591,804,670.20/84,489.36
  6. Step 6: Final answer
    x = 42,511.92

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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.