Home / 20,807.12-31,218.56-12,492.94

Finding the Fourth Proportional to 20,807.12, 31,218.56 and 12,492.94

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Solution

The fourth proportional to 20,807.12, 31,218.56 and 12,492.94 is: 18,744.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,807.12 : 31,218.56 = 12,492.94 : x
  2. Step 2: Convert to fraction form
    20,807.12/31,218.56 = 12,492.94/x
  3. Step 3: Cross multiply
    20,807.12x = 31,218.56 × 12,492.94
  4. Step 4: Simplify right side
    20,807.12x = 390,011,596.97
  5. Step 5: Solve for x
    x = 390,011,596.97/20,807.12
  6. Step 6: Final answer
    x = 18,744.14

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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.