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Finding the Fourth Proportional to 279,355.65, 385,518.87 and 152,039.31

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Solution

The fourth proportional to 279,355.65, 385,518.87 and 152,039.31 is: 209,818.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,355.65 : 385,518.87 = 152,039.31 : x
  2. Step 2: Convert to fraction form
    279,355.65/385,518.87 = 152,039.31/x
  3. Step 3: Cross multiply
    279,355.65x = 385,518.87 × 152,039.31
  4. Step 4: Simplify right side
    279,355.65x = 58,614,022,986.78
  5. Step 5: Solve for x
    x = 58,614,022,986.78/279,355.65
  6. Step 6: Final answer
    x = 209,818.64

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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.