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Finding the Fourth Proportional to 66,209.70, 91,362.54 and 39,347.02

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Solution

The fourth proportional to 66,209.70, 91,362.54 and 39,347.02 is: 54,294.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,209.70 : 91,362.54 = 39,347.02 : x
  2. Step 2: Convert to fraction form
    66,209.70/91,362.54 = 39,347.02/x
  3. Step 3: Cross multiply
    66,209.70x = 91,362.54 × 39,347.02
  4. Step 4: Simplify right side
    66,209.70x = 3,594,843,688.63
  5. Step 5: Solve for x
    x = 3,594,843,688.63/66,209.70
  6. Step 6: Final answer
    x = 54,294.82

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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.