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Finding the Fourth Proportional to 1,555.65, 2,333.45 and 385.66

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Solution

The fourth proportional to 1,555.65, 2,333.45 and 385.66 is: 578.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,555.65 : 2,333.45 = 385.66 : x
  2. Step 2: Convert to fraction form
    1,555.65/2,333.45 = 385.66/x
  3. Step 3: Cross multiply
    1,555.65x = 2,333.45 × 385.66
  4. Step 4: Simplify right side
    1,555.65x = 899,914.56
  5. Step 5: Solve for x
    x = 899,914.56/1,555.65
  6. Step 6: Final answer
    x = 578.48

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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.