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Finding the Fourth Proportional to 678,622.96, 936,574.59 and 388,261.45

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Solution

The fourth proportional to 678,622.96, 936,574.59 and 388,261.45 is: 535,843.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,622.96 : 936,574.59 = 388,261.45 : x
  2. Step 2: Convert to fraction form
    678,622.96/936,574.59 = 388,261.45/x
  3. Step 3: Cross multiply
    678,622.96x = 936,574.59 × 388,261.45
  4. Step 4: Simplify right side
    678,622.96x = 363,635,808,346.56
  5. Step 5: Solve for x
    x = 363,635,808,346.56/678,622.96
  6. Step 6: Final answer
    x = 535,843.66

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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.