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Finding the Fourth Proportional to 13,909.32, 20,866.41 and 7,666.65

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Solution

The fourth proportional to 13,909.32, 20,866.41 and 7,666.65 is: 11,501.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,909.32 : 20,866.41 = 7,666.65 : x
  2. Step 2: Convert to fraction form
    13,909.32/20,866.41 = 7,666.65/x
  3. Step 3: Cross multiply
    13,909.32x = 20,866.41 × 7,666.65
  4. Step 4: Simplify right side
    13,909.32x = 159,975,462.23
  5. Step 5: Solve for x
    x = 159,975,462.23/13,909.32
  6. Step 6: Final answer
    x = 11,501.31

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.