Home / 138,827.18-191,585.40-78,406.85

Finding the Fourth Proportional to 138,827.18, 191,585.40 and 78,406.85

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Solution

The fourth proportional to 138,827.18, 191,585.40 and 78,406.85 is: 108,203.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,827.18 : 191,585.40 = 78,406.85 : x
  2. Step 2: Convert to fraction form
    138,827.18/191,585.40 = 78,406.85/x
  3. Step 3: Cross multiply
    138,827.18x = 191,585.40 × 78,406.85
  4. Step 4: Simplify right side
    138,827.18x = 15,021,607,719.99
  5. Step 5: Solve for x
    x = 15,021,607,719.99/138,827.18
  6. Step 6: Final answer
    x = 108,203.65

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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.