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Finding the Fourth Proportional to 25,378.61, 34,988.92 and 20,824.61

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Solution

The fourth proportional to 25,378.61, 34,988.92 and 20,824.61 is: 28,710.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,378.61 : 34,988.92 = 20,824.61 : x
  2. Step 2: Convert to fraction form
    25,378.61/34,988.92 = 20,824.61/x
  3. Step 3: Cross multiply
    25,378.61x = 34,988.92 × 20,824.61
  4. Step 4: Simplify right side
    25,378.61x = 728,630,386.32
  5. Step 5: Solve for x
    x = 728,630,386.32/25,378.61
  6. Step 6: Final answer
    x = 28,710.42

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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.