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Finding the Fourth Proportional to 236,787.40, 355,142.72 and 86,990.84

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Solution

The fourth proportional to 236,787.40, 355,142.72 and 86,990.84 is: 130,472.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    236,787.40 : 355,142.72 = 86,990.84 : x
  2. Step 2: Convert to fraction form
    236,787.40/355,142.72 = 86,990.84/x
  3. Step 3: Cross multiply
    236,787.40x = 355,142.72 × 86,990.84
  4. Step 4: Simplify right side
    236,787.40x = 30,894,163,532.68
  5. Step 5: Solve for x
    x = 30,894,163,532.68/236,787.40
  6. Step 6: Final answer
    x = 130,472.16

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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.