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Finding the Fourth Proportional to 643,476.48, 887,986.14 and 356,991.66

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Solution

The fourth proportional to 643,476.48, 887,986.14 and 356,991.66 is: 492,642.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,476.48 : 887,986.14 = 356,991.66 : x
  2. Step 2: Convert to fraction form
    643,476.48/887,986.14 = 356,991.66/x
  3. Step 3: Cross multiply
    643,476.48x = 887,986.14 × 356,991.66
  4. Step 4: Simplify right side
    643,476.48x = 317,003,646,175.59
  5. Step 5: Solve for x
    x = 317,003,646,175.59/643,476.48
  6. Step 6: Final answer
    x = 492,642.16

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.