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Finding the Fourth Proportional to 20,460.42, 30,691.04 and 6,420.15

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Solution

The fourth proportional to 20,460.42, 30,691.04 and 6,420.15 is: 9,630.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,460.42 : 30,691.04 = 6,420.15 : x
  2. Step 2: Convert to fraction form
    20,460.42/30,691.04 = 6,420.15/x
  3. Step 3: Cross multiply
    20,460.42x = 30,691.04 × 6,420.15
  4. Step 4: Simplify right side
    20,460.42x = 197,041,048.36
  5. Step 5: Solve for x
    x = 197,041,048.36/20,460.42
  6. Step 6: Final answer
    x = 9,630.35

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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.