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Finding the Fourth Proportional to 1,481.20, 2,221.80 and 507.40

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Solution

The fourth proportional to 1,481.20, 2,221.80 and 507.40 is: 761.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,481.20 : 2,221.80 = 507.40 : x
  2. Step 2: Convert to fraction form
    1,481.20/2,221.80 = 507.40/x
  3. Step 3: Cross multiply
    1,481.20x = 2,221.80 × 507.40
  4. Step 4: Simplify right side
    1,481.20x = 1,127,341.32
  5. Step 5: Solve for x
    x = 1,127,341.32/1,481.20
  6. Step 6: Final answer
    x = 761.10

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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.