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Finding the Fourth Proportional to 9,085.90, 13,612.65 and 7,789.90

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Solution

The fourth proportional to 9,085.90, 13,612.65 and 7,789.90 is: 11,670.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,085.90 : 13,612.65 = 7,789.90 : x
  2. Step 2: Convert to fraction form
    9,085.90/13,612.65 = 7,789.90/x
  3. Step 3: Cross multiply
    9,085.90x = 13,612.65 × 7,789.90
  4. Step 4: Simplify right side
    9,085.90x = 106,041,182.24
  5. Step 5: Solve for x
    x = 106,041,182.24/9,085.90
  6. Step 6: Final answer
    x = 11,670.96

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.