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Finding the Fourth Proportional to 12,779.04, 17,635.20 and 7,811.04

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Solution

The fourth proportional to 12,779.04, 17,635.20 and 7,811.04 is: 10,779.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,779.04 : 17,635.20 = 7,811.04 : x
  2. Step 2: Convert to fraction form
    12,779.04/17,635.20 = 7,811.04/x
  3. Step 3: Cross multiply
    12,779.04x = 17,635.20 × 7,811.04
  4. Step 4: Simplify right side
    12,779.04x = 137,749,252.61
  5. Step 5: Solve for x
    x = 137,749,252.61/12,779.04
  6. Step 6: Final answer
    x = 10,779.31

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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.