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Finding the Fourth Proportional to 643,265.12, 887,706.44 and 356,785.21

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Solution

The fourth proportional to 643,265.12, 887,706.44 and 356,785.21 is: 492,363.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,265.12 : 887,706.44 = 356,785.21 : x
  2. Step 2: Convert to fraction form
    643,265.12/887,706.44 = 356,785.21/x
  3. Step 3: Cross multiply
    643,265.12x = 887,706.44 × 356,785.21
  4. Step 4: Simplify right side
    643,265.12x = 316,720,528,613.75
  5. Step 5: Solve for x
    x = 316,720,528,613.75/643,265.12
  6. Step 6: Final answer
    x = 492,363.91

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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.