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Finding the Fourth Proportional to 388,736.79, 536,440.20 and 216,645.60

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Solution

The fourth proportional to 388,736.79, 536,440.20 and 216,645.60 is: 298,961.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,736.79 : 536,440.20 = 216,645.60 : x
  2. Step 2: Convert to fraction form
    388,736.79/536,440.20 = 216,645.60/x
  3. Step 3: Cross multiply
    388,736.79x = 536,440.20 × 216,645.60
  4. Step 4: Simplify right side
    388,736.79x = 116,217,408,993.12
  5. Step 5: Solve for x
    x = 116,217,408,993.12/388,736.79
  6. Step 6: Final answer
    x = 298,961.69

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.