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Finding the Fourth Proportional to 128,388.60, 177,220.80 and 88,235.28

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Solution

The fourth proportional to 128,388.60, 177,220.80 and 88,235.28 is: 121,795.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,388.60 : 177,220.80 = 88,235.28 : x
  2. Step 2: Convert to fraction form
    128,388.60/177,220.80 = 88,235.28/x
  3. Step 3: Cross multiply
    128,388.60x = 177,220.80 × 88,235.28
  4. Step 4: Simplify right side
    128,388.60x = 15,637,126,909.82
  5. Step 5: Solve for x
    x = 15,637,126,909.82/128,388.60
  6. Step 6: Final answer
    x = 121,795.29

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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.