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Finding the Fourth Proportional to 386,790.40, 580,185.60 and 106,307.20

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Solution

The fourth proportional to 386,790.40, 580,185.60 and 106,307.20 is: 159,460.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,790.40 : 580,185.60 = 106,307.20 : x
  2. Step 2: Convert to fraction form
    386,790.40/580,185.60 = 106,307.20/x
  3. Step 3: Cross multiply
    386,790.40x = 580,185.60 × 106,307.20
  4. Step 4: Simplify right side
    386,790.40x = 61,677,906,616.32
  5. Step 5: Solve for x
    x = 61,677,906,616.32/386,790.40
  6. Step 6: Final answer
    x = 159,460.80

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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.