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Finding the Fourth Proportional to 20,969.89, 28,946.01 and 13,898.59

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Solution

The fourth proportional to 20,969.89, 28,946.01 and 13,898.59 is: 19,185.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,969.89 : 28,946.01 = 13,898.59 : x
  2. Step 2: Convert to fraction form
    20,969.89/28,946.01 = 13,898.59/x
  3. Step 3: Cross multiply
    20,969.89x = 28,946.01 × 13,898.59
  4. Step 4: Simplify right side
    20,969.89x = 402,308,725.13
  5. Step 5: Solve for x
    x = 402,308,725.13/20,969.89
  6. Step 6: Final answer
    x = 19,185.07

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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.