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Finding the Fourth Proportional to 212,219.40, 318,329.10 and 85,920.15

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Solution

The fourth proportional to 212,219.40, 318,329.10 and 85,920.15 is: 128,880.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,219.40 : 318,329.10 = 85,920.15 : x
  2. Step 2: Convert to fraction form
    212,219.40/318,329.10 = 85,920.15/x
  3. Step 3: Cross multiply
    212,219.40x = 318,329.10 × 85,920.15
  4. Step 4: Simplify right side
    212,219.40x = 27,350,884,021.37
  5. Step 5: Solve for x
    x = 27,350,884,021.37/212,219.40
  6. Step 6: Final answer
    x = 128,880.23

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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.