Home / 139,119.61-191,985.09-78,688.95

Finding the Fourth Proportional to 139,119.61, 191,985.09 and 78,688.95

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Solution

The fourth proportional to 139,119.61, 191,985.09 and 78,688.95 is: 108,590.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,119.61 : 191,985.09 = 78,688.95 : x
  2. Step 2: Convert to fraction form
    139,119.61/191,985.09 = 78,688.95/x
  3. Step 3: Cross multiply
    139,119.61x = 191,985.09 × 78,688.95
  4. Step 4: Simplify right side
    139,119.61x = 15,107,105,212.64
  5. Step 5: Solve for x
    x = 15,107,105,212.64/139,119.61
  6. Step 6: Final answer
    x = 108,590.77

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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.