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Finding the Fourth Proportional to 15,782.76, 21,779.88 and 8,612.34

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Solution

The fourth proportional to 15,782.76, 21,779.88 and 8,612.34 is: 11,884.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,782.76 : 21,779.88 = 8,612.34 : x
  2. Step 2: Convert to fraction form
    15,782.76/21,779.88 = 8,612.34/x
  3. Step 3: Cross multiply
    15,782.76x = 21,779.88 × 8,612.34
  4. Step 4: Simplify right side
    15,782.76x = 187,575,731.72
  5. Step 5: Solve for x
    x = 187,575,731.72/15,782.76
  6. Step 6: Final answer
    x = 11,884.85

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Double scale
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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.