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Finding the Fourth Proportional to 258,718.65, 388,079.70 and 90,238.35

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Solution

The fourth proportional to 258,718.65, 388,079.70 and 90,238.35 is: 135,358.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,718.65 : 388,079.70 = 90,238.35 : x
  2. Step 2: Convert to fraction form
    258,718.65/388,079.70 = 90,238.35/x
  3. Step 3: Cross multiply
    258,718.65x = 388,079.70 × 90,238.35
  4. Step 4: Simplify right side
    258,718.65x = 35,019,669,404.90
  5. Step 5: Solve for x
    x = 35,019,669,404.90/258,718.65
  6. Step 6: Final answer
    x = 135,358.12

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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.