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Finding the Fourth Proportional to 718,921, 992,110.98 and 400,969

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Solution

The fourth proportional to 718,921, 992,110.98 and 400,969 is: 553,337.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,921 : 992,110.98 = 400,969 : x
  2. Step 2: Convert to fraction form
    718,921/992,110.98 = 400,969/x
  3. Step 3: Cross multiply
    718,921x = 992,110.98 × 400,969
  4. Step 4: Simplify right side
    718,921x = 397,805,747,539.62
  5. Step 5: Solve for x
    x = 397,805,747,539.62/718,921
  6. Step 6: Final answer
    x = 553,337.22

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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.