Home / 30,998.72-42,750.24-20,384.32

Finding the Fourth Proportional to 30,998.72, 42,750.24 and 20,384.32

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Solution

The fourth proportional to 30,998.72, 42,750.24 and 20,384.32 is: 28,111.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,998.72 : 42,750.24 = 20,384.32 : x
  2. Step 2: Convert to fraction form
    30,998.72/42,750.24 = 20,384.32/x
  3. Step 3: Cross multiply
    30,998.72x = 42,750.24 × 20,384.32
  4. Step 4: Simplify right side
    30,998.72x = 871,434,572.24
  5. Step 5: Solve for x
    x = 871,434,572.24/30,998.72
  6. Step 6: Final answer
    x = 28,111.95

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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.