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Finding the Fourth Proportional to 21,417.92, 29,559.48 and 11,987

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Solution

The fourth proportional to 21,417.92, 29,559.48 and 11,987 is: 16,543.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,417.92 : 29,559.48 = 11,987 : x
  2. Step 2: Convert to fraction form
    21,417.92/29,559.48 = 11,987/x
  3. Step 3: Cross multiply
    21,417.92x = 29,559.48 × 11,987
  4. Step 4: Simplify right side
    21,417.92x = 354,329,486.76
  5. Step 5: Solve for x
    x = 354,329,486.76/21,417.92
  6. Step 6: Final answer
    x = 16,543.60

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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.