Home / 128,878.08-177,860.16-72,293.28

Finding the Fourth Proportional to 128,878.08, 177,860.16 and 72,293.28

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Solution

The fourth proportional to 128,878.08, 177,860.16 and 72,293.28 is: 99,769.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,878.08 : 177,860.16 = 72,293.28 : x
  2. Step 2: Convert to fraction form
    128,878.08/177,860.16 = 72,293.28/x
  3. Step 3: Cross multiply
    128,878.08x = 177,860.16 × 72,293.28
  4. Step 4: Simplify right side
    128,878.08x = 12,858,094,347.72
  5. Step 5: Solve for x
    x = 12,858,094,347.72/128,878.08
  6. Step 6: Final answer
    x = 99,769.44

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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.