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Finding the Fourth Proportional to 13,686.94, 20,530.17 and 7,445.47

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Solution

The fourth proportional to 13,686.94, 20,530.17 and 7,445.47 is: 11,168.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,686.94 : 20,530.17 = 7,445.47 : x
  2. Step 2: Convert to fraction form
    13,686.94/20,530.17 = 7,445.47/x
  3. Step 3: Cross multiply
    13,686.94x = 20,530.17 × 7,445.47
  4. Step 4: Simplify right side
    13,686.94x = 152,856,764.83
  5. Step 5: Solve for x
    x = 152,856,764.83/13,686.94
  6. Step 6: Final answer
    x = 11,168.07

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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.