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Finding the Fourth Proportional to 643,889.12, 888,522.52 and 357,386.66

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Solution

The fourth proportional to 643,889.12, 888,522.52 and 357,386.66 is: 493,168.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,889.12 : 888,522.52 = 357,386.66 : x
  2. Step 2: Convert to fraction form
    643,889.12/888,522.52 = 357,386.66/x
  3. Step 3: Cross multiply
    643,889.12x = 888,522.52 × 357,386.66
  4. Step 4: Simplify right side
    643,889.12x = 317,546,095,757.58
  5. Step 5: Solve for x
    x = 317,546,095,757.58/643,889.12
  6. Step 6: Final answer
    x = 493,168.91

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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.