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Finding the Fourth Proportional to 92,945.60, 128,275.92 and 55,220

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Solution

The fourth proportional to 92,945.60, 128,275.92 and 55,220 is: 76,210.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,945.60 : 128,275.92 = 55,220 : x
  2. Step 2: Convert to fraction form
    92,945.60/128,275.92 = 55,220/x
  3. Step 3: Cross multiply
    92,945.60x = 128,275.92 × 55,220
  4. Step 4: Simplify right side
    92,945.60x = 7,083,396,302.40
  5. Step 5: Solve for x
    x = 7,083,396,302.40/92,945.60
  6. Step 6: Final answer
    x = 76,210.13

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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.