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Finding the Fourth Proportional to 999.90, 1,378.86 and 860.52

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Solution

The fourth proportional to 999.90, 1,378.86 and 860.52 is: 1,186.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.90 : 1,378.86 = 860.52 : x
  2. Step 2: Convert to fraction form
    999.90/1,378.86 = 860.52/x
  3. Step 3: Cross multiply
    999.90x = 1,378.86 × 860.52
  4. Step 4: Simplify right side
    999.90x = 1,186,536.61
  5. Step 5: Solve for x
    x = 1,186,536.61/999.90
  6. Step 6: Final answer
    x = 1,186.66

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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.