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Finding the Fourth Proportional to 128,580.78, 177,440.30 and 71,993.10

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Solution

The fourth proportional to 128,580.78, 177,440.30 and 71,993.10 is: 99,349.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,580.78 : 177,440.30 = 71,993.10 : x
  2. Step 2: Convert to fraction form
    128,580.78/177,440.30 = 71,993.10/x
  3. Step 3: Cross multiply
    128,580.78x = 177,440.30 × 71,993.10
  4. Step 4: Simplify right side
    128,580.78x = 12,774,477,261.93
  5. Step 5: Solve for x
    x = 12,774,477,261.93/128,580.78
  6. Step 6: Final answer
    x = 99,349.82

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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.