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Finding the Fourth Proportional to 13,611.60, 18,783.94 and 7,643.36

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Solution

The fourth proportional to 13,611.60, 18,783.94 and 7,643.36 is: 10,547.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,611.60 : 18,783.94 = 7,643.36 : x
  2. Step 2: Convert to fraction form
    13,611.60/18,783.94 = 7,643.36/x
  3. Step 3: Cross multiply
    13,611.60x = 18,783.94 × 7,643.36
  4. Step 4: Simplify right side
    13,611.60x = 143,572,415.64
  5. Step 5: Solve for x
    x = 143,572,415.64/13,611.60
  6. Step 6: Final answer
    x = 10,547.80

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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.