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Finding the Fourth Proportional to 258,187.80, 387,165.06 and 91,980.12

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Solution

The fourth proportional to 258,187.80, 387,165.06 and 91,980.12 is: 137,928.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,187.80 : 387,165.06 = 91,980.12 : x
  2. Step 2: Convert to fraction form
    258,187.80/387,165.06 = 91,980.12/x
  3. Step 3: Cross multiply
    258,187.80x = 387,165.06 × 91,980.12
  4. Step 4: Simplify right side
    258,187.80x = 35,611,488,678.61
  5. Step 5: Solve for x
    x = 35,611,488,678.61/258,187.80
  6. Step 6: Final answer
    x = 137,928.63

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.