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Finding the Fourth Proportional to 258,618.60, 388,106.27 and 90,140.32

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Solution

The fourth proportional to 258,618.60, 388,106.27 and 90,140.32 is: 135,272.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,618.60 : 388,106.27 = 90,140.32 : x
  2. Step 2: Convert to fraction form
    258,618.60/388,106.27 = 90,140.32/x
  3. Step 3: Cross multiply
    258,618.60x = 388,106.27 × 90,140.32
  4. Step 4: Simplify right side
    258,618.60x = 34,984,023,032.99
  5. Step 5: Solve for x
    x = 34,984,023,032.99/258,618.60
  6. Step 6: Final answer
    x = 135,272.65

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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.