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Finding the Fourth Proportional to 1,531.03, 2,112.95 and 858.82

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Solution

The fourth proportional to 1,531.03, 2,112.95 and 858.82 is: 1,185.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,531.03 : 2,112.95 = 858.82 : x
  2. Step 2: Convert to fraction form
    1,531.03/2,112.95 = 858.82/x
  3. Step 3: Cross multiply
    1,531.03x = 2,112.95 × 858.82
  4. Step 4: Simplify right side
    1,531.03x = 1,814,639.42
  5. Step 5: Solve for x
    x = 1,814,639.42/1,531.03
  6. Step 6: Final answer
    x = 1,185.24

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1.5x scale

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.