Home / 138,621.48-191,297.42-78,191.94

Finding the Fourth Proportional to 138,621.48, 191,297.42 and 78,191.94

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Solution

The fourth proportional to 138,621.48, 191,297.42 and 78,191.94 is: 107,904.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,621.48 : 191,297.42 = 78,191.94 : x
  2. Step 2: Convert to fraction form
    138,621.48/191,297.42 = 78,191.94/x
  3. Step 3: Cross multiply
    138,621.48x = 191,297.42 × 78,191.94
  4. Step 4: Simplify right side
    138,621.48x = 14,957,916,386.79
  5. Step 5: Solve for x
    x = 14,957,916,386.79/138,621.48
  6. Step 6: Final answer
    x = 107,904.75

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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.