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Finding the Fourth Proportional to 100,987.83, 139,356.85 and 55,663.32

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Solution

The fourth proportional to 100,987.83, 139,356.85 and 55,663.32 is: 76,811.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,987.83 : 139,356.85 = 55,663.32 : x
  2. Step 2: Convert to fraction form
    100,987.83/139,356.85 = 55,663.32/x
  3. Step 3: Cross multiply
    100,987.83x = 139,356.85 × 55,663.32
  4. Step 4: Simplify right side
    100,987.83x = 7,757,064,935.74
  5. Step 5: Solve for x
    x = 7,757,064,935.74/100,987.83
  6. Step 6: Final answer
    x = 76,811.88

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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.