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Finding the Fourth Proportional to 12,559.86, 17,339.01 and 9,720.90

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Solution

The fourth proportional to 12,559.86, 17,339.01 and 9,720.90 is: 13,419.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,559.86 : 17,339.01 = 9,720.90 : x
  2. Step 2: Convert to fraction form
    12,559.86/17,339.01 = 9,720.90/x
  3. Step 3: Cross multiply
    12,559.86x = 17,339.01 × 9,720.90
  4. Step 4: Simplify right side
    12,559.86x = 168,550,782.31
  5. Step 5: Solve for x
    x = 168,550,782.31/12,559.86
  6. Step 6: Final answer
    x = 13,419.80

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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.