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Finding the Fourth Proportional to 1,482.61, 2,045.33 and 861.25

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Solution

The fourth proportional to 1,482.61, 2,045.33 and 861.25 is: 1,188.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,482.61 : 2,045.33 = 861.25 : x
  2. Step 2: Convert to fraction form
    1,482.61/2,045.33 = 861.25/x
  3. Step 3: Cross multiply
    1,482.61x = 2,045.33 × 861.25
  4. Step 4: Simplify right side
    1,482.61x = 1,761,536.16
  5. Step 5: Solve for x
    x = 1,761,536.16/1,482.61
  6. Step 6: Final answer
    x = 1,188.13

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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.