Home / 128,709.28-177,618.64-72,121.04

Finding the Fourth Proportional to 128,709.28, 177,618.64 and 72,121.04

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Solution

The fourth proportional to 128,709.28, 177,618.64 and 72,121.04 is: 99,526.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,709.28 : 177,618.64 = 72,121.04 : x
  2. Step 2: Convert to fraction form
    128,709.28/177,618.64 = 72,121.04/x
  3. Step 3: Cross multiply
    128,709.28x = 177,618.64 × 72,121.04
  4. Step 4: Simplify right side
    128,709.28x = 12,810,041,040.19
  5. Step 5: Solve for x
    x = 12,810,041,040.19/128,709.28
  6. Step 6: Final answer
    x = 99,526.94

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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.