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Finding the Fourth Proportional to 128,922.40, 177,876.40 and 83,602.20

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Solution

The fourth proportional to 128,922.40, 177,876.40 and 83,602.20 is: 115,347.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,922.40 : 177,876.40 = 83,602.20 : x
  2. Step 2: Convert to fraction form
    128,922.40/177,876.40 = 83,602.20/x
  3. Step 3: Cross multiply
    128,922.40x = 177,876.40 × 83,602.20
  4. Step 4: Simplify right side
    128,922.40x = 14,870,858,368.08
  5. Step 5: Solve for x
    x = 14,870,858,368.08/128,922.40
  6. Step 6: Final answer
    x = 115,347.36

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1.5x scale

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.