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Finding the Fourth Proportional to 478,910.40, 718,462.80 and 163,399.20

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Solution

The fourth proportional to 478,910.40, 718,462.80 and 163,399.20 is: 245,131.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    478,910.40 : 718,462.80 = 163,399.20 : x
  2. Step 2: Convert to fraction form
    478,910.40/718,462.80 = 163,399.20/x
  3. Step 3: Cross multiply
    478,910.40x = 718,462.80 × 163,399.20
  4. Step 4: Simplify right side
    478,910.40x = 117,396,246,749.76
  5. Step 5: Solve for x
    x = 117,396,246,749.76/478,910.40
  6. Step 6: Final answer
    x = 245,131.96

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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.