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Finding the Fourth Proportional to 809,643.60, 1,213,428.60 and 621,723.60

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Solution

The fourth proportional to 809,643.60, 1,213,428.60 and 621,723.60 is: 931,789.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    809,643.60 : 1,213,428.60 = 621,723.60 : x
  2. Step 2: Convert to fraction form
    809,643.60/1,213,428.60 = 621,723.60/x
  3. Step 3: Cross multiply
    809,643.60x = 1,213,428.60 × 621,723.60
  4. Step 4: Simplify right side
    809,643.60x = 754,417,197,534.96
  5. Step 5: Solve for x
    x = 754,417,197,534.96/809,643.60
  6. Step 6: Final answer
    x = 931,789.24

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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.