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Finding the Fourth Proportional to 100,809.81, 139,118.04 and 55,492.34

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Solution

The fourth proportional to 100,809.81, 139,118.04 and 55,492.34 is: 76,579.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,809.81 : 139,118.04 = 55,492.34 : x
  2. Step 2: Convert to fraction form
    100,809.81/139,118.04 = 55,492.34/x
  3. Step 3: Cross multiply
    100,809.81x = 139,118.04 × 55,492.34
  4. Step 4: Simplify right side
    100,809.81x = 7,719,984,880.22
  5. Step 5: Solve for x
    x = 7,719,984,880.22/100,809.81
  6. Step 6: Final answer
    x = 76,579.70

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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.