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Finding the Fourth Proportional to 21,000.80, 28,980.78 and 11,569.70

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Solution

The fourth proportional to 21,000.80, 28,980.78 and 11,569.70 is: 15,966.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,000.80 : 28,980.78 = 11,569.70 : x
  2. Step 2: Convert to fraction form
    21,000.80/28,980.78 = 11,569.70/x
  3. Step 3: Cross multiply
    21,000.80x = 28,980.78 × 11,569.70
  4. Step 4: Simplify right side
    21,000.80x = 335,298,930.37
  5. Step 5: Solve for x
    x = 335,298,930.37/21,000.80
  6. Step 6: Final answer
    x = 15,966.01

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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.