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Finding the Fourth Proportional to 643,887.69, 888,384.94 and 402,415.55

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Solution

The fourth proportional to 643,887.69, 888,384.94 and 402,415.55 is: 555,220.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,887.69 : 888,384.94 = 402,415.55 : x
  2. Step 2: Convert to fraction form
    643,887.69/888,384.94 = 402,415.55/x
  3. Step 3: Cross multiply
    643,887.69x = 888,384.94 × 402,415.55
  4. Step 4: Simplify right side
    643,887.69x = 357,499,914,241.82
  5. Step 5: Solve for x
    x = 357,499,914,241.82/643,887.69
  6. Step 6: Final answer
    x = 555,220.92

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1.5x scale

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.