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Finding the Fourth Proportional to 128,655.54, 177,552.81 and 72,075.42

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Solution

The fourth proportional to 128,655.54, 177,552.81 and 72,075.42 is: 99,468.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,655.54 : 177,552.81 = 72,075.42 : x
  2. Step 2: Convert to fraction form
    128,655.54/177,552.81 = 72,075.42/x
  3. Step 3: Cross multiply
    128,655.54x = 177,552.81 × 72,075.42
  4. Step 4: Simplify right side
    128,655.54x = 12,797,193,352.93
  5. Step 5: Solve for x
    x = 12,797,193,352.93/128,655.54
  6. Step 6: Final answer
    x = 99,468.65

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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.