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Finding the Fourth Proportional to 138,408.52, 191,004.42 and 77,980.12

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Solution

The fourth proportional to 138,408.52, 191,004.42 and 77,980.12 is: 107,612.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,408.52 : 191,004.42 = 77,980.12 : x
  2. Step 2: Convert to fraction form
    138,408.52/191,004.42 = 77,980.12/x
  3. Step 3: Cross multiply
    138,408.52x = 191,004.42 × 77,980.12
  4. Step 4: Simplify right side
    138,408.52x = 14,894,547,592.13
  5. Step 5: Solve for x
    x = 14,894,547,592.13/138,408.52
  6. Step 6: Final answer
    x = 107,612.94

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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.