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Finding the Fourth Proportional to 9,187.85, 12,679.35 and 5,208.87

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Solution

The fourth proportional to 9,187.85, 12,679.35 and 5,208.87 is: 7,188.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,187.85 : 12,679.35 = 5,208.87 : x
  2. Step 2: Convert to fraction form
    9,187.85/12,679.35 = 5,208.87/x
  3. Step 3: Cross multiply
    9,187.85x = 12,679.35 × 5,208.87
  4. Step 4: Simplify right side
    9,187.85x = 66,045,085.83
  5. Step 5: Solve for x
    x = 66,045,085.83/9,187.85
  6. Step 6: Final answer
    x = 7,188.31

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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.