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Finding the Fourth Proportional to 258,823.62, 388,328.84 and 90,368.76

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Solution

The fourth proportional to 258,823.62, 388,328.84 and 90,368.76 is: 135,585.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,823.62 : 388,328.84 = 90,368.76 : x
  2. Step 2: Convert to fraction form
    258,823.62/388,328.84 = 90,368.76/x
  3. Step 3: Cross multiply
    258,823.62x = 388,328.84 × 90,368.76
  4. Step 4: Simplify right side
    258,823.62x = 35,092,794,792.69
  5. Step 5: Solve for x
    x = 35,092,794,792.69/258,823.62
  6. Step 6: Final answer
    x = 135,585.75

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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.