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Finding the Fourth Proportional to 1,319,331.60, 1,978,997.40 and 420,839.10

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Solution

The fourth proportional to 1,319,331.60, 1,978,997.40 and 420,839.10 is: 631,258.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319,331.60 : 1,978,997.40 = 420,839.10 : x
  2. Step 2: Convert to fraction form
    1,319,331.60/1,978,997.40 = 420,839.10/x
  3. Step 3: Cross multiply
    1,319,331.60x = 1,978,997.40 × 420,839.10
  4. Step 4: Simplify right side
    1,319,331.60x = 832,839,484,718.34
  5. Step 5: Solve for x
    x = 832,839,484,718.34/1,319,331.60
  6. Step 6: Final answer
    x = 631,258.65

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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.