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Finding the Fourth Proportional to 279,511.53, 385,724.58 and 156,986.88

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Solution

The fourth proportional to 279,511.53, 385,724.58 and 156,986.88 is: 216,641.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,511.53 : 385,724.58 = 156,986.88 : x
  2. Step 2: Convert to fraction form
    279,511.53/385,724.58 = 156,986.88/x
  3. Step 3: Cross multiply
    279,511.53x = 385,724.58 × 156,986.88
  4. Step 4: Simplify right side
    279,511.53x = 60,553,698,353.51
  5. Step 5: Solve for x
    x = 60,553,698,353.51/279,511.53
  6. Step 6: Final answer
    x = 216,641.15

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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.