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Finding the Fourth Proportional to 139,053.88, 191,880.15 and 85,341.16

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Solution

The fourth proportional to 139,053.88, 191,880.15 and 85,341.16 is: 117,762.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,053.88 : 191,880.15 = 85,341.16 : x
  2. Step 2: Convert to fraction form
    139,053.88/191,880.15 = 85,341.16/x
  3. Step 3: Cross multiply
    139,053.88x = 191,880.15 × 85,341.16
  4. Step 4: Simplify right side
    139,053.88x = 16,375,274,581.97
  5. Step 5: Solve for x
    x = 16,375,274,581.97/139,053.88
  6. Step 6: Final answer
    x = 117,762.08

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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.