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Finding the Fourth Proportional to 13,129.96, 18,122.80 and 7,468

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Solution

The fourth proportional to 13,129.96, 18,122.80 and 7,468 is: 10,307.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,129.96 : 18,122.80 = 7,468 : x
  2. Step 2: Convert to fraction form
    13,129.96/18,122.80 = 7,468/x
  3. Step 3: Cross multiply
    13,129.96x = 18,122.80 × 7,468
  4. Step 4: Simplify right side
    13,129.96x = 135,341,070.40
  5. Step 5: Solve for x
    x = 135,341,070.40/13,129.96
  6. Step 6: Final answer
    x = 10,307.81

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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.