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Finding the Fourth Proportional to 84,978.48, 117,355.20 and 70,019.28

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Solution

The fourth proportional to 84,978.48, 117,355.20 and 70,019.28 is: 96,696.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,978.48 : 117,355.20 = 70,019.28 : x
  2. Step 2: Convert to fraction form
    84,978.48/117,355.20 = 70,019.28/x
  3. Step 3: Cross multiply
    84,978.48x = 117,355.20 × 70,019.28
  4. Step 4: Simplify right side
    84,978.48x = 8,217,126,608.26
  5. Step 5: Solve for x
    x = 8,217,126,608.26/84,978.48
  6. Step 6: Final answer
    x = 96,696.56

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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.