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Finding the Fourth Proportional to 212,616.80, 318,925.20 and 118,138.40

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Solution

The fourth proportional to 212,616.80, 318,925.20 and 118,138.40 is: 177,207.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,616.80 : 318,925.20 = 118,138.40 : x
  2. Step 2: Convert to fraction form
    212,616.80/318,925.20 = 118,138.40/x
  3. Step 3: Cross multiply
    212,616.80x = 318,925.20 × 118,138.40
  4. Step 4: Simplify right side
    212,616.80x = 37,677,312,847.68
  5. Step 5: Solve for x
    x = 37,677,312,847.68/212,616.80
  6. Step 6: Final answer
    x = 177,207.60

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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.