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Finding the Fourth Proportional to 78,899.97, 108,809.84 and 61,674.62

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Solution

The fourth proportional to 78,899.97, 108,809.84 and 61,674.62 is: 85,054.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,899.97 : 108,809.84 = 61,674.62 : x
  2. Step 2: Convert to fraction form
    78,899.97/108,809.84 = 61,674.62/x
  3. Step 3: Cross multiply
    78,899.97x = 108,809.84 × 61,674.62
  4. Step 4: Simplify right side
    78,899.97x = 6,710,804,681.84
  5. Step 5: Solve for x
    x = 6,710,804,681.84/78,899.97
  6. Step 6: Final answer
    x = 85,054.59

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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.