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Finding the Fourth Proportional to 643,887.42, 888,384.60 and 402,415.29

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Solution

The fourth proportional to 643,887.42, 888,384.60 and 402,415.29 is: 555,220.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,887.42 : 888,384.60 = 402,415.29 : x
  2. Step 2: Convert to fraction form
    643,887.42/888,384.60 = 402,415.29/x
  3. Step 3: Cross multiply
    643,887.42x = 888,384.60 × 402,415.29
  4. Step 4: Simplify right side
    643,887.42x = 357,499,546,440.53
  5. Step 5: Solve for x
    x = 357,499,546,440.53/643,887.42
  6. Step 6: Final answer
    x = 555,220.58

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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.