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Finding the Fourth Proportional to 20,762.55, 28,649.72 and 11,686.79

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Solution

The fourth proportional to 20,762.55, 28,649.72 and 11,686.79 is: 16,126.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,762.55 : 28,649.72 = 11,686.79 : x
  2. Step 2: Convert to fraction form
    20,762.55/28,649.72 = 11,686.79/x
  3. Step 3: Cross multiply
    20,762.55x = 28,649.72 × 11,686.79
  4. Step 4: Simplify right side
    20,762.55x = 334,823,362.04
  5. Step 5: Solve for x
    x = 334,823,362.04/20,762.55
  6. Step 6: Final answer
    x = 16,126.31

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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.