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Finding the Fourth Proportional to 642,387.98, 962,530.73 and 388,900.17

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Solution

The fourth proportional to 642,387.98, 962,530.73 and 388,900.17 is: 582,713.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,387.98 : 962,530.73 = 388,900.17 : x
  2. Step 2: Convert to fraction form
    642,387.98/962,530.73 = 388,900.17/x
  3. Step 3: Cross multiply
    642,387.98x = 962,530.73 × 388,900.17
  4. Step 4: Simplify right side
    642,387.98x = 374,328,364,041.10
  5. Step 5: Solve for x
    x = 374,328,364,041.10/642,387.98
  6. Step 6: Final answer
    x = 582,713.83

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.