Home / 13,128.78-18,117.90-7,160.75

Finding the Fourth Proportional to 13,128.78, 18,117.90 and 7,160.75

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Solution

The fourth proportional to 13,128.78, 18,117.90 and 7,160.75 is: 9,881.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,128.78 : 18,117.90 = 7,160.75 : x
  2. Step 2: Convert to fraction form
    13,128.78/18,117.90 = 7,160.75/x
  3. Step 3: Cross multiply
    13,128.78x = 18,117.90 × 7,160.75
  4. Step 4: Simplify right side
    13,128.78x = 129,737,752.43
  5. Step 5: Solve for x
    x = 129,737,752.43/13,128.78
  6. Step 6: Final answer
    x = 9,881.94

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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.