Home / 20,902.30-31,363.70-9,809.89

Finding the Fourth Proportional to 20,902.30, 31,363.70 and 9,809.89

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Solution

The fourth proportional to 20,902.30, 31,363.70 and 9,809.89 is: 14,719.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,902.30 : 31,363.70 = 9,809.89 : x
  2. Step 2: Convert to fraction form
    20,902.30/31,363.70 = 9,809.89/x
  3. Step 3: Cross multiply
    20,902.30x = 31,363.70 × 9,809.89
  4. Step 4: Simplify right side
    20,902.30x = 307,674,368.58
  5. Step 5: Solve for x
    x = 307,674,368.58/20,902.30
  6. Step 6: Final answer
    x = 14,719.64

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.