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Finding the Fourth Proportional to 21,000.42, 28,980.36 and 11,568.78

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Solution

The fourth proportional to 21,000.42, 28,980.36 and 11,568.78 is: 15,964.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,000.42 : 28,980.36 = 11,568.78 : x
  2. Step 2: Convert to fraction form
    21,000.42/28,980.36 = 11,568.78/x
  3. Step 3: Cross multiply
    21,000.42x = 28,980.36 × 11,568.78
  4. Step 4: Simplify right side
    21,000.42x = 335,267,409.16
  5. Step 5: Solve for x
    x = 335,267,409.16/21,000.42
  6. Step 6: Final answer
    x = 15,964.80

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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.