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Finding the Fourth Proportional to 128,349.68, 177,129.24 and 77,378.64

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Solution

The fourth proportional to 128,349.68, 177,129.24 and 77,378.64 is: 106,786.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,349.68 : 177,129.24 = 77,378.64 : x
  2. Step 2: Convert to fraction form
    128,349.68/177,129.24 = 77,378.64/x
  3. Step 3: Cross multiply
    128,349.68x = 177,129.24 × 77,378.64
  4. Step 4: Simplify right side
    128,349.68x = 13,706,019,695.43
  5. Step 5: Solve for x
    x = 13,706,019,695.43/128,349.68
  6. Step 6: Final answer
    x = 106,786.55

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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.