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Finding the Fourth Proportional to 128,956.96, 177,960.08 and 72,368.80

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Solution

The fourth proportional to 128,956.96, 177,960.08 and 72,368.80 is: 99,868.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,956.96 : 177,960.08 = 72,368.80 : x
  2. Step 2: Convert to fraction form
    128,956.96/177,960.08 = 72,368.80/x
  3. Step 3: Cross multiply
    128,956.96x = 177,960.08 × 72,368.80
  4. Step 4: Simplify right side
    128,956.96x = 12,878,757,437.50
  5. Step 5: Solve for x
    x = 12,878,757,437.50/128,956.96
  6. Step 6: Final answer
    x = 99,868.65

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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.