Home / 20,426.76-28,203.12-15,722.28

Finding the Fourth Proportional to 20,426.76, 28,203.12 and 15,722.28

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Solution

The fourth proportional to 20,426.76, 28,203.12 and 15,722.28 is: 21,707.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,426.76 : 28,203.12 = 15,722.28 : x
  2. Step 2: Convert to fraction form
    20,426.76/28,203.12 = 15,722.28/x
  3. Step 3: Cross multiply
    20,426.76x = 28,203.12 × 15,722.28
  4. Step 4: Simplify right side
    20,426.76x = 443,417,349.51
  5. Step 5: Solve for x
    x = 443,417,349.51/20,426.76
  6. Step 6: Final answer
    x = 21,707.67

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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.