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Finding the Fourth Proportional to 388,991.76, 536,663.84 and 261,465.36

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Solution

The fourth proportional to 388,991.76, 536,663.84 and 261,465.36 is: 360,724.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,991.76 : 536,663.84 = 261,465.36 : x
  2. Step 2: Convert to fraction form
    388,991.76/536,663.84 = 261,465.36/x
  3. Step 3: Cross multiply
    388,991.76x = 536,663.84 × 261,465.36
  4. Step 4: Simplify right side
    388,991.76x = 140,319,004,124.58
  5. Step 5: Solve for x
    x = 140,319,004,124.58/388,991.76
  6. Step 6: Final answer
    x = 360,724.88

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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.