Home / 20,715.91-28,588-11,284.27

Finding the Fourth Proportional to 20,715.91, 28,588 and 11,284.27

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Solution

The fourth proportional to 20,715.91, 28,588 and 11,284.27 is: 15,572.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,715.91 : 28,588 = 11,284.27 : x
  2. Step 2: Convert to fraction form
    20,715.91/28,588 = 11,284.27/x
  3. Step 3: Cross multiply
    20,715.91x = 28,588 × 11,284.27
  4. Step 4: Simplify right side
    20,715.91x = 322,594,567.82
  5. Step 5: Solve for x
    x = 322,594,567.82/20,715.91
  6. Step 6: Final answer
    x = 15,572.31

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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.