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Finding the Fourth Proportional to 1,530.64, 2,112.33 and 858.47

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Solution

The fourth proportional to 1,530.64, 2,112.33 and 858.47 is: 1,184.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,530.64 : 2,112.33 = 858.47 : x
  2. Step 2: Convert to fraction form
    1,530.64/2,112.33 = 858.47/x
  3. Step 3: Cross multiply
    1,530.64x = 2,112.33 × 858.47
  4. Step 4: Simplify right side
    1,530.64x = 1,813,371.94
  5. Step 5: Solve for x
    x = 1,813,371.94/1,530.64
  6. Step 6: Final answer
    x = 1,184.71

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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.