Home / 138,408.06-191,003.75-77,979.63

Finding the Fourth Proportional to 138,408.06, 191,003.75 and 77,979.63

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Solution

The fourth proportional to 138,408.06, 191,003.75 and 77,979.63 is: 107,612.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,408.06 : 191,003.75 = 77,979.63 : x
  2. Step 2: Convert to fraction form
    138,408.06/191,003.75 = 77,979.63/x
  3. Step 3: Cross multiply
    138,408.06x = 191,003.75 × 77,979.63
  4. Step 4: Simplify right side
    138,408.06x = 14,894,401,363.71
  5. Step 5: Solve for x
    x = 14,894,401,363.71/138,408.06
  6. Step 6: Final answer
    x = 107,612.24

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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.