Home / 185,011.73-255,316.95-100,128.78

Finding the Fourth Proportional to 185,011.73, 255,316.95 and 100,128.78

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Solution

The fourth proportional to 185,011.73, 255,316.95 and 100,128.78 is: 138,178.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    185,011.73 : 255,316.95 = 100,128.78 : x
  2. Step 2: Convert to fraction form
    185,011.73/255,316.95 = 100,128.78/x
  3. Step 3: Cross multiply
    185,011.73x = 255,316.95 × 100,128.78
  4. Step 4: Simplify right side
    185,011.73x = 25,564,574,716.82
  5. Step 5: Solve for x
    x = 25,564,574,716.82/185,011.73
  6. Step 6: Final answer
    x = 138,178.13

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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.