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Finding the Fourth Proportional to 128,718.72, 177,652.44 and 75,035.16

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Solution

The fourth proportional to 128,718.72, 177,652.44 and 75,035.16 is: 103,560.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,718.72 : 177,652.44 = 75,035.16 : x
  2. Step 2: Convert to fraction form
    128,718.72/177,652.44 = 75,035.16/x
  3. Step 3: Cross multiply
    128,718.72x = 177,652.44 × 75,035.16
  4. Step 4: Simplify right side
    128,718.72x = 13,330,179,259.79
  5. Step 5: Solve for x
    x = 13,330,179,259.79/128,718.72
  6. Step 6: Final answer
    x = 103,560.53

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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.