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Finding the Fourth Proportional to 678,865.94, 936,730.86 and 392,330.69

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Solution

The fourth proportional to 678,865.94, 936,730.86 and 392,330.69 is: 541,356.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,865.94 : 936,730.86 = 392,330.69 : x
  2. Step 2: Convert to fraction form
    678,865.94/936,730.86 = 392,330.69/x
  3. Step 3: Cross multiply
    678,865.94x = 936,730.86 × 392,330.69
  4. Step 4: Simplify right side
    678,865.94x = 367,508,266,009.09
  5. Step 5: Solve for x
    x = 367,508,266,009.09/678,865.94
  6. Step 6: Final answer
    x = 541,356.17

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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.