Home / 138,639.63-191,329.35-78,208.83

Finding the Fourth Proportional to 138,639.63, 191,329.35 and 78,208.83

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Solution

The fourth proportional to 138,639.63, 191,329.35 and 78,208.83 is: 107,931.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,639.63 : 191,329.35 = 78,208.83 : x
  2. Step 2: Convert to fraction form
    138,639.63/191,329.35 = 78,208.83/x
  3. Step 3: Cross multiply
    138,639.63x = 191,329.35 × 78,208.83
  4. Step 4: Simplify right side
    138,639.63x = 14,963,644,595.73
  5. Step 5: Solve for x
    x = 14,963,644,595.73/138,639.63
  6. Step 6: Final answer
    x = 107,931.95

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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.