Home / 13,689.08-18,890.46-7,720.92

Finding the Fourth Proportional to 13,689.08, 18,890.46 and 7,720.92

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Solution

The fourth proportional to 13,689.08, 18,890.46 and 7,720.92 is: 10,654.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,689.08 : 18,890.46 = 7,720.92 : x
  2. Step 2: Convert to fraction form
    13,689.08/18,890.46 = 7,720.92/x
  3. Step 3: Cross multiply
    13,689.08x = 18,890.46 × 7,720.92
  4. Step 4: Simplify right side
    13,689.08x = 145,851,730.42
  5. Step 5: Solve for x
    x = 145,851,730.42/13,689.08
  6. Step 6: Final answer
    x = 10,654.60

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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.