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Finding the Fourth Proportional to 20,980.52, 28,955.78 and 12,596.52

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Solution

The fourth proportional to 20,980.52, 28,955.78 and 12,596.52 is: 17,384.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,980.52 : 28,955.78 = 12,596.52 : x
  2. Step 2: Convert to fraction form
    20,980.52/28,955.78 = 12,596.52/x
  3. Step 3: Cross multiply
    20,980.52x = 28,955.78 × 12,596.52
  4. Step 4: Simplify right side
    20,980.52x = 364,742,061.89
  5. Step 5: Solve for x
    x = 364,742,061.89/20,980.52
  6. Step 6: Final answer
    x = 17,384.80

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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.