Home / 20,475.30-28,263.96-12,920.28

Finding the Fourth Proportional to 20,475.30, 28,263.96 and 12,920.28

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Solution

The fourth proportional to 20,475.30, 28,263.96 and 12,920.28 is: 17,835.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,475.30 : 28,263.96 = 12,920.28 : x
  2. Step 2: Convert to fraction form
    20,475.30/28,263.96 = 12,920.28/x
  3. Step 3: Cross multiply
    20,475.30x = 28,263.96 × 12,920.28
  4. Step 4: Simplify right side
    20,475.30x = 365,178,277.11
  5. Step 5: Solve for x
    x = 365,178,277.11/20,475.30
  6. Step 6: Final answer
    x = 17,835.06

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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.