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Finding the Fourth Proportional to 318,970.80, 478,456.20 and 213,908.40

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Solution

The fourth proportional to 318,970.80, 478,456.20 and 213,908.40 is: 320,862.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,970.80 : 478,456.20 = 213,908.40 : x
  2. Step 2: Convert to fraction form
    318,970.80/478,456.20 = 213,908.40/x
  3. Step 3: Cross multiply
    318,970.80x = 478,456.20 × 213,908.40
  4. Step 4: Simplify right side
    318,970.80x = 102,345,800,212.08
  5. Step 5: Solve for x
    x = 102,345,800,212.08/318,970.80
  6. Step 6: Final answer
    x = 320,862.60

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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.