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Finding the Fourth Proportional to 28,658.80, 39,639 and 25,346.80

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Solution

The fourth proportional to 28,658.80, 39,639 and 25,346.80 is: 35,058.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,658.80 : 39,639 = 25,346.80 : x
  2. Step 2: Convert to fraction form
    28,658.80/39,639 = 25,346.80/x
  3. Step 3: Cross multiply
    28,658.80x = 39,639 × 25,346.80
  4. Step 4: Simplify right side
    28,658.80x = 1,004,721,805.20
  5. Step 5: Solve for x
    x = 1,004,721,805.20/28,658.80
  6. Step 6: Final answer
    x = 35,058.06

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.