Home / 31,114.08-42,960.96-20,518.56

Finding the Fourth Proportional to 31,114.08, 42,960.96 and 20,518.56

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Solution

The fourth proportional to 31,114.08, 42,960.96 and 20,518.56 is: 28,331.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,114.08 : 42,960.96 = 20,518.56 : x
  2. Step 2: Convert to fraction form
    31,114.08/42,960.96 = 20,518.56/x
  3. Step 3: Cross multiply
    31,114.08x = 42,960.96 × 20,518.56
  4. Step 4: Simplify right side
    31,114.08x = 881,497,035.42
  5. Step 5: Solve for x
    x = 881,497,035.42/31,114.08
  6. Step 6: Final answer
    x = 28,331.13

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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.