Home / 138,450.52-191,048.72-78,011.20

Finding the Fourth Proportional to 138,450.52, 191,048.72 and 78,011.20

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Solution

The fourth proportional to 138,450.52, 191,048.72 and 78,011.20 is: 107,648.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,450.52 : 191,048.72 = 78,011.20 : x
  2. Step 2: Convert to fraction form
    138,450.52/191,048.72 = 78,011.20/x
  3. Step 3: Cross multiply
    138,450.52x = 191,048.72 × 78,011.20
  4. Step 4: Simplify right side
    138,450.52x = 14,903,939,905.66
  5. Step 5: Solve for x
    x = 14,903,939,905.66/138,450.52
  6. Step 6: Final answer
    x = 107,648.13

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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.