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Finding the Fourth Proportional to 21,000.92, 28,980.90 and 11,569.40

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Solution

The fourth proportional to 21,000.92, 28,980.90 and 11,569.40 is: 15,965.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,000.92 : 28,980.90 = 11,569.40 : x
  2. Step 2: Convert to fraction form
    21,000.92/28,980.90 = 11,569.40/x
  3. Step 3: Cross multiply
    21,000.92x = 28,980.90 × 11,569.40
  4. Step 4: Simplify right side
    21,000.92x = 335,291,624.46
  5. Step 5: Solve for x
    x = 335,291,624.46/21,000.92
  6. Step 6: Final answer
    x = 15,965.57

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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.