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Finding the Fourth Proportional to 20,940.81, 28,868.43 and 14,970.30

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Solution

The fourth proportional to 20,940.81, 28,868.43 and 14,970.30 is: 20,637.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,940.81 : 28,868.43 = 14,970.30 : x
  2. Step 2: Convert to fraction form
    20,940.81/28,868.43 = 14,970.30/x
  3. Step 3: Cross multiply
    20,940.81x = 28,868.43 × 14,970.30
  4. Step 4: Simplify right side
    20,940.81x = 432,169,057.63
  5. Step 5: Solve for x
    x = 432,169,057.63/20,940.81
  6. Step 6: Final answer
    x = 20,637.65

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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.