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Finding the Fourth Proportional to 13,609.01, 18,779.14 and 7,639.31

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Solution

The fourth proportional to 13,609.01, 18,779.14 and 7,639.31 is: 10,541.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,609.01 : 18,779.14 = 7,639.31 : x
  2. Step 2: Convert to fraction form
    13,609.01/18,779.14 = 7,639.31/x
  3. Step 3: Cross multiply
    13,609.01x = 18,779.14 × 7,639.31
  4. Step 4: Simplify right side
    13,609.01x = 143,459,728.49
  5. Step 5: Solve for x
    x = 143,459,728.49/13,609.01
  6. Step 6: Final answer
    x = 10,541.52

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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.