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Finding the Fourth Proportional to 643,057.80, 887,376.51 and 356,567.28

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Solution

The fourth proportional to 643,057.80, 887,376.51 and 356,567.28 is: 492,038.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,057.80 : 887,376.51 = 356,567.28 : x
  2. Step 2: Convert to fraction form
    643,057.80/887,376.51 = 356,567.28/x
  3. Step 3: Cross multiply
    643,057.80x = 887,376.51 × 356,567.28
  4. Step 4: Simplify right side
    643,057.80x = 316,409,428,506.59
  5. Step 5: Solve for x
    x = 316,409,428,506.59/643,057.80
  6. Step 6: Final answer
    x = 492,038.86

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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.