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Finding the Fourth Proportional to 18,967.68, 28,455.36 and 6,656.64

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Solution

The fourth proportional to 18,967.68, 28,455.36 and 6,656.64 is: 9,986.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,967.68 : 28,455.36 = 6,656.64 : x
  2. Step 2: Convert to fraction form
    18,967.68/28,455.36 = 6,656.64/x
  3. Step 3: Cross multiply
    18,967.68x = 28,455.36 × 6,656.64
  4. Step 4: Simplify right side
    18,967.68x = 189,417,087.59
  5. Step 5: Solve for x
    x = 189,417,087.59/18,967.68
  6. Step 6: Final answer
    x = 9,986.31

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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.