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Finding the Fourth Proportional to 13,643.40, 20,454.30 and 7,487.40

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Solution

The fourth proportional to 13,643.40, 20,454.30 and 7,487.40 is: 11,225.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,643.40 : 20,454.30 = 7,487.40 : x
  2. Step 2: Convert to fraction form
    13,643.40/20,454.30 = 7,487.40/x
  3. Step 3: Cross multiply
    13,643.40x = 20,454.30 × 7,487.40
  4. Step 4: Simplify right side
    13,643.40x = 153,149,525.82
  5. Step 5: Solve for x
    x = 153,149,525.82/13,643.40
  6. Step 6: Final answer
    x = 11,225.17

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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.