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Finding the Fourth Proportional to 1,057.61, 1,586.39 and 288.11

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Solution

The fourth proportional to 1,057.61, 1,586.39 and 288.11 is: 432.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,057.61 : 1,586.39 = 288.11 : x
  2. Step 2: Convert to fraction form
    1,057.61/1,586.39 = 288.11/x
  3. Step 3: Cross multiply
    1,057.61x = 1,586.39 × 288.11
  4. Step 4: Simplify right side
    1,057.61x = 457,045.45
  5. Step 5: Solve for x
    x = 457,045.45/1,057.61
  6. Step 6: Final answer
    x = 432.15

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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.