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Finding the Fourth Proportional to 643,226.16, 887,706.60 and 356,838.50

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Solution

The fourth proportional to 643,226.16, 887,706.60 and 356,838.50 is: 492,467.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,226.16 : 887,706.60 = 356,838.50 : x
  2. Step 2: Convert to fraction form
    643,226.16/887,706.60 = 356,838.50/x
  3. Step 3: Cross multiply
    643,226.16x = 887,706.60 × 356,838.50
  4. Step 4: Simplify right side
    643,226.16x = 316,767,891,584.10
  5. Step 5: Solve for x
    x = 316,767,891,584.10/643,226.16
  6. Step 6: Final answer
    x = 492,467.36

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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.