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Finding the Fourth Proportional to 80,420.22, 120,507.32 and 42,985.62

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Solution

The fourth proportional to 80,420.22, 120,507.32 and 42,985.62 is: 64,412.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,420.22 : 120,507.32 = 42,985.62 : x
  2. Step 2: Convert to fraction form
    80,420.22/120,507.32 = 42,985.62/x
  3. Step 3: Cross multiply
    80,420.22x = 120,507.32 × 42,985.62
  4. Step 4: Simplify right side
    80,420.22x = 5,180,081,649.81
  5. Step 5: Solve for x
    x = 5,180,081,649.81/80,420.22
  6. Step 6: Final answer
    x = 64,412.68

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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.