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Finding the Fourth Proportional to 386,841.60, 579,955.20 and 211,737.60

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Solution

The fourth proportional to 386,841.60, 579,955.20 and 211,737.60 is: 317,438.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,841.60 : 579,955.20 = 211,737.60 : x
  2. Step 2: Convert to fraction form
    386,841.60/579,955.20 = 211,737.60/x
  3. Step 3: Cross multiply
    386,841.60x = 579,955.20 × 211,737.60
  4. Step 4: Simplify right side
    386,841.60x = 122,798,322,155.52
  5. Step 5: Solve for x
    x = 122,798,322,155.52/386,841.60
  6. Step 6: Final answer
    x = 317,438.25

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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.