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Finding the Fourth Proportional to 15,762.85, 21,752.62 and 8,689.26

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Solution

The fourth proportional to 15,762.85, 21,752.62 and 8,689.26 is: 11,991.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,762.85 : 21,752.62 = 8,689.26 : x
  2. Step 2: Convert to fraction form
    15,762.85/21,752.62 = 8,689.26/x
  3. Step 3: Cross multiply
    15,762.85x = 21,752.62 × 8,689.26
  4. Step 4: Simplify right side
    15,762.85x = 189,014,170.86
  5. Step 5: Solve for x
    x = 189,014,170.86/15,762.85
  6. Step 6: Final answer
    x = 11,991.12

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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.