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Finding the Fourth Proportional to 66,118.84, 91,239.66 and 39,259.96

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Solution

The fourth proportional to 66,118.84, 91,239.66 and 39,259.96 is: 54,176.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,118.84 : 91,239.66 = 39,259.96 : x
  2. Step 2: Convert to fraction form
    66,118.84/91,239.66 = 39,259.96/x
  3. Step 3: Cross multiply
    66,118.84x = 91,239.66 × 39,259.96
  4. Step 4: Simplify right side
    66,118.84x = 3,582,065,402.01
  5. Step 5: Solve for x
    x = 3,582,065,402.01/66,118.84
  6. Step 6: Final answer
    x = 54,176.17

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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.