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Finding the Fourth Proportional to 258,538.80, 387,808.20 and 68,998.80

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Solution

The fourth proportional to 258,538.80, 387,808.20 and 68,998.80 is: 103,498.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,538.80 : 387,808.20 = 68,998.80 : x
  2. Step 2: Convert to fraction form
    258,538.80/387,808.20 = 68,998.80/x
  3. Step 3: Cross multiply
    258,538.80x = 387,808.20 × 68,998.80
  4. Step 4: Simplify right side
    258,538.80x = 26,758,300,430.16
  5. Step 5: Solve for x
    x = 26,758,300,430.16/258,538.80
  6. Step 6: Final answer
    x = 103,498.20

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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.