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Finding the Fourth Proportional to 10,691.64, 14,739.30 and 9,438.84

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Solution

The fourth proportional to 10,691.64, 14,739.30 and 9,438.84 is: 13,012.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,691.64 : 14,739.30 = 9,438.84 : x
  2. Step 2: Convert to fraction form
    10,691.64/14,739.30 = 9,438.84/x
  3. Step 3: Cross multiply
    10,691.64x = 14,739.30 × 9,438.84
  4. Step 4: Simplify right side
    10,691.64x = 139,121,894.41
  5. Step 5: Solve for x
    x = 139,121,894.41/10,691.64
  6. Step 6: Final answer
    x = 13,012.21

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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.