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Finding the Fourth Proportional to 100,987.77, 139,356.76 and 55,663.25

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Solution

The fourth proportional to 100,987.77, 139,356.76 and 55,663.25 is: 76,811.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,987.77 : 139,356.76 = 55,663.25 : x
  2. Step 2: Convert to fraction form
    100,987.77/139,356.76 = 55,663.25/x
  3. Step 3: Cross multiply
    100,987.77x = 139,356.76 × 55,663.25
  4. Step 4: Simplify right side
    100,987.77x = 7,757,050,171.07
  5. Step 5: Solve for x
    x = 7,757,050,171.07/100,987.77
  6. Step 6: Final answer
    x = 76,811.78

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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.