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Finding the Fourth Proportional to 13,115, 18,098.48 and 7,146.72

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Solution

The fourth proportional to 13,115, 18,098.48 and 7,146.72 is: 9,862.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,115 : 18,098.48 = 7,146.72 : x
  2. Step 2: Convert to fraction form
    13,115/18,098.48 = 7,146.72/x
  3. Step 3: Cross multiply
    13,115x = 18,098.48 × 7,146.72
  4. Step 4: Simplify right side
    13,115x = 129,344,768.99
  5. Step 5: Solve for x
    x = 129,344,768.99/13,115
  6. Step 6: Final answer
    x = 9,862.35

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Double scale
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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.