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Finding the Fourth Proportional to 12,655.86, 17,465.22 and 6,990.75

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Solution

The fourth proportional to 12,655.86, 17,465.22 and 6,990.75 is: 9,647.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,655.86 : 17,465.22 = 6,990.75 : x
  2. Step 2: Convert to fraction form
    12,655.86/17,465.22 = 6,990.75/x
  3. Step 3: Cross multiply
    12,655.86x = 17,465.22 × 6,990.75
  4. Step 4: Simplify right side
    12,655.86x = 122,094,986.72
  5. Step 5: Solve for x
    x = 122,094,986.72/12,655.86
  6. Step 6: Final answer
    x = 9,647.31

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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.