Home / 15,740.21-21,720.50-8,666.63

Finding the Fourth Proportional to 15,740.21, 21,720.50 and 8,666.63

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Solution

The fourth proportional to 15,740.21, 21,720.50 and 8,666.63 is: 11,959.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,740.21 : 21,720.50 = 8,666.63 : x
  2. Step 2: Convert to fraction form
    15,740.21/21,720.50 = 8,666.63/x
  3. Step 3: Cross multiply
    15,740.21x = 21,720.50 × 8,666.63
  4. Step 4: Simplify right side
    15,740.21x = 188,243,384.98
  5. Step 5: Solve for x
    x = 188,243,384.98/15,740.21
  6. Step 6: Final answer
    x = 11,959.40

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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.