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Finding the Fourth Proportional to 550,428.90, 825,643.35 and 399,963.30

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Solution

The fourth proportional to 550,428.90, 825,643.35 and 399,963.30 is: 599,944.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    550,428.90 : 825,643.35 = 399,963.30 : x
  2. Step 2: Convert to fraction form
    550,428.90/825,643.35 = 399,963.30/x
  3. Step 3: Cross multiply
    550,428.90x = 825,643.35 × 399,963.30
  4. Step 4: Simplify right side
    550,428.90x = 330,227,038,889.06
  5. Step 5: Solve for x
    x = 330,227,038,889.06/550,428.90
  6. Step 6: Final answer
    x = 599,944.95

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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.