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Finding the Fourth Proportional to 521,796.80, 783,278.40 and 403,990.40

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Solution

The fourth proportional to 521,796.80, 783,278.40 and 403,990.40 is: 606,437.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,796.80 : 783,278.40 = 403,990.40 : x
  2. Step 2: Convert to fraction form
    521,796.80/783,278.40 = 403,990.40/x
  3. Step 3: Cross multiply
    521,796.80x = 783,278.40 × 403,990.40
  4. Step 4: Simplify right side
    521,796.80x = 316,436,954,127.36
  5. Step 5: Solve for x
    x = 316,436,954,127.36/521,796.80
  6. Step 6: Final answer
    x = 606,437.13

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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.