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Finding the Fourth Proportional to 212,662.80, 318,994.20 and 86,302.80

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Solution

The fourth proportional to 212,662.80, 318,994.20 and 86,302.80 is: 129,454.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,662.80 : 318,994.20 = 86,302.80 : x
  2. Step 2: Convert to fraction form
    212,662.80/318,994.20 = 86,302.80/x
  3. Step 3: Cross multiply
    212,662.80x = 318,994.20 × 86,302.80
  4. Step 4: Simplify right side
    212,662.80x = 27,530,092,643.76
  5. Step 5: Solve for x
    x = 27,530,092,643.76/212,662.80
  6. Step 6: Final answer
    x = 129,454.20

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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.