Home / 13,777.55-18,979.27-9,989.58

Finding the Fourth Proportional to 13,777.55, 18,979.27 and 9,989.58

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Solution

The fourth proportional to 13,777.55, 18,979.27 and 9,989.58 is: 13,761.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,777.55 : 18,979.27 = 9,989.58 : x
  2. Step 2: Convert to fraction form
    13,777.55/18,979.27 = 9,989.58/x
  3. Step 3: Cross multiply
    13,777.55x = 18,979.27 × 9,989.58
  4. Step 4: Simplify right side
    13,777.55x = 189,594,911.03
  5. Step 5: Solve for x
    x = 189,594,911.03/13,777.55
  6. Step 6: Final answer
    x = 13,761.15

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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.