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Finding the Fourth Proportional to 212,626.80, 318,940.20 and 86,266.80

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Solution

The fourth proportional to 212,626.80, 318,940.20 and 86,266.80 is: 129,400.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,626.80 : 318,940.20 = 86,266.80 : x
  2. Step 2: Convert to fraction form
    212,626.80/318,940.20 = 86,266.80/x
  3. Step 3: Cross multiply
    212,626.80x = 318,940.20 × 86,266.80
  4. Step 4: Simplify right side
    212,626.80x = 27,513,950,445.36
  5. Step 5: Solve for x
    x = 27,513,950,445.36/212,626.80
  6. Step 6: Final answer
    x = 129,400.20

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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.