Home / 30,475.20-42,005.60-20,400.16

Finding the Fourth Proportional to 30,475.20, 42,005.60 and 20,400.16

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Solution

The fourth proportional to 30,475.20, 42,005.60 and 20,400.16 is: 28,118.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,475.20 : 42,005.60 = 20,400.16 : x
  2. Step 2: Convert to fraction form
    30,475.20/42,005.60 = 20,400.16/x
  3. Step 3: Cross multiply
    30,475.20x = 42,005.60 × 20,400.16
  4. Step 4: Simplify right side
    30,475.20x = 856,920,960.90
  5. Step 5: Solve for x
    x = 856,920,960.90/30,475.20
  6. Step 6: Final answer
    x = 28,118.63

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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.