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Finding the Fourth Proportional to 643,907.78, 888,596.22 and 402,330.50

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Solution

The fourth proportional to 643,907.78, 888,596.22 and 402,330.50 is: 555,218.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,907.78 : 888,596.22 = 402,330.50 : x
  2. Step 2: Convert to fraction form
    643,907.78/888,596.22 = 402,330.50/x
  3. Step 3: Cross multiply
    643,907.78x = 888,596.22 × 402,330.50
  4. Step 4: Simplify right side
    643,907.78x = 357,509,361,490.71
  5. Step 5: Solve for x
    x = 357,509,361,490.71/643,907.78
  6. Step 6: Final answer
    x = 555,218.27

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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.