Home / 12,489.81-18,643.60-10,913.38

Finding the Fourth Proportional to 12,489.81, 18,643.60 and 10,913.38

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Solution

The fourth proportional to 12,489.81, 18,643.60 and 10,913.38 is: 16,290.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,489.81 : 18,643.60 = 10,913.38 : x
  2. Step 2: Convert to fraction form
    12,489.81/18,643.60 = 10,913.38/x
  3. Step 3: Cross multiply
    12,489.81x = 18,643.60 × 10,913.38
  4. Step 4: Simplify right side
    12,489.81x = 203,464,543.58
  5. Step 5: Solve for x
    x = 203,464,543.58/12,489.81
  6. Step 6: Final answer
    x = 16,290.44

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.