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Finding the Fourth Proportional to 643,889.87, 888,571.45 and 402,312.53

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Solution

The fourth proportional to 643,889.87, 888,571.45 and 402,312.53 is: 555,193.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,889.87 : 888,571.45 = 402,312.53 : x
  2. Step 2: Convert to fraction form
    643,889.87/888,571.45 = 402,312.53/x
  3. Step 3: Cross multiply
    643,889.87x = 888,571.45 × 402,312.53
  4. Step 4: Simplify right side
    643,889.87x = 357,483,430,859.59
  5. Step 5: Solve for x
    x = 357,483,430,859.59/643,889.87
  6. Step 6: Final answer
    x = 555,193.44

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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.