Home / 20,490.72-28,276.43-11,415.87

Finding the Fourth Proportional to 20,490.72, 28,276.43 and 11,415.87

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Solution

The fourth proportional to 20,490.72, 28,276.43 and 11,415.87 is: 15,753.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,490.72 : 28,276.43 = 11,415.87 : x
  2. Step 2: Convert to fraction form
    20,490.72/28,276.43 = 11,415.87/x
  3. Step 3: Cross multiply
    20,490.72x = 28,276.43 × 11,415.87
  4. Step 4: Simplify right side
    20,490.72x = 322,799,950.04
  5. Step 5: Solve for x
    x = 322,799,950.04/20,490.72
  6. Step 6: Final answer
    x = 15,753.47

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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.