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Finding the Fourth Proportional to 128,545.56, 177,408.72 and 77,587.56

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Solution

The fourth proportional to 128,545.56, 177,408.72 and 77,587.56 is: 107,080.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,545.56 : 177,408.72 = 77,587.56 : x
  2. Step 2: Convert to fraction form
    128,545.56/177,408.72 = 77,587.56/x
  3. Step 3: Cross multiply
    128,545.56x = 177,408.72 × 77,587.56
  4. Step 4: Simplify right side
    128,545.56x = 13,764,709,707.52
  5. Step 5: Solve for x
    x = 13,764,709,707.52/128,545.56
  6. Step 6: Final answer
    x = 107,080.40

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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.