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Finding the Fourth Proportional to 8,779.22, 12,130.79 and 6,507.31

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Solution

The fourth proportional to 8,779.22, 12,130.79 and 6,507.31 is: 8,991.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,779.22 : 12,130.79 = 6,507.31 : x
  2. Step 2: Convert to fraction form
    8,779.22/12,130.79 = 6,507.31/x
  3. Step 3: Cross multiply
    8,779.22x = 12,130.79 × 6,507.31
  4. Step 4: Simplify right side
    8,779.22x = 78,938,748.21
  5. Step 5: Solve for x
    x = 78,938,748.21/8,779.22
  6. Step 6: Final answer
    x = 8,991.54

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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.