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Finding the Fourth Proportional to 1,433,276.59, 1,978,003.54 and 821,531.30

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Solution

The fourth proportional to 1,433,276.59, 1,978,003.54 and 821,531.30 is: 1,133,760.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,433,276.59 : 1,978,003.54 = 821,531.30 : x
  2. Step 2: Convert to fraction form
    1,433,276.59/1,978,003.54 = 821,531.30/x
  3. Step 3: Cross multiply
    1,433,276.59x = 1,978,003.54 × 821,531.30
  4. Step 4: Simplify right side
    1,433,276.59x = 1,624,991,815,513.15
  5. Step 5: Solve for x
    x = 1,624,991,815,513.15/1,433,276.59
  6. Step 6: Final answer
    x = 1,133,760.11

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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.