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Finding the Fourth Proportional to 42,431.80, 63,639.60 and 12,850.60

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Solution

The fourth proportional to 42,431.80, 63,639.60 and 12,850.60 is: 19,273.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,431.80 : 63,639.60 = 12,850.60 : x
  2. Step 2: Convert to fraction form
    42,431.80/63,639.60 = 12,850.60/x
  3. Step 3: Cross multiply
    42,431.80x = 63,639.60 × 12,850.60
  4. Step 4: Simplify right side
    42,431.80x = 817,807,043.76
  5. Step 5: Solve for x
    x = 817,807,043.76/42,431.80
  6. Step 6: Final answer
    x = 19,273.45

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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.