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Finding the Fourth Proportional to 478,933, 718,403.10 and 212,621.80

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Solution

The fourth proportional to 478,933, 718,403.10 and 212,621.80 is: 318,934.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    478,933 : 718,403.10 = 212,621.80 : x
  2. Step 2: Convert to fraction form
    478,933/718,403.10 = 212,621.80/x
  3. Step 3: Cross multiply
    478,933x = 718,403.10 × 212,621.80
  4. Step 4: Simplify right side
    478,933x = 152,748,160,247.58
  5. Step 5: Solve for x
    x = 152,748,160,247.58/478,933
  6. Step 6: Final answer
    x = 318,934.30

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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.