Home / 185,011.47-255,315.87-100,128.57

Finding the Fourth Proportional to 185,011.47, 255,315.87 and 100,128.57

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Solution

The fourth proportional to 185,011.47, 255,315.87 and 100,128.57 is: 138,177.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    185,011.47 : 255,315.87 = 100,128.57 : x
  2. Step 2: Convert to fraction form
    185,011.47/255,315.87 = 100,128.57/x
  3. Step 3: Cross multiply
    185,011.47x = 255,315.87 × 100,128.57
  4. Step 4: Simplify right side
    185,011.47x = 25,564,412,961.41
  5. Step 5: Solve for x
    x = 25,564,412,961.41/185,011.47
  6. Step 6: Final answer
    x = 138,177.45

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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.