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Finding the Fourth Proportional to 681,476.81, 940,415.94 and 391,136.16

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Solution

The fourth proportional to 681,476.81, 940,415.94 and 391,136.16 is: 539,755.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    681,476.81 : 940,415.94 = 391,136.16 : x
  2. Step 2: Convert to fraction form
    681,476.81/940,415.94 = 391,136.16/x
  3. Step 3: Cross multiply
    681,476.81x = 940,415.94 × 391,136.16
  4. Step 4: Simplify right side
    681,476.81x = 367,830,679,574.39
  5. Step 5: Solve for x
    x = 367,830,679,574.39/681,476.81
  6. Step 6: Final answer
    x = 539,755.24

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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.