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Finding the Fourth Proportional to 13,155.74, 18,154.94 and 7,187.51

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Solution

The fourth proportional to 13,155.74, 18,154.94 and 7,187.51 is: 9,918.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,155.74 : 18,154.94 = 7,187.51 : x
  2. Step 2: Convert to fraction form
    13,155.74/18,154.94 = 7,187.51/x
  3. Step 3: Cross multiply
    13,155.74x = 18,154.94 × 7,187.51
  4. Step 4: Simplify right side
    13,155.74x = 130,488,812.80
  5. Step 5: Solve for x
    x = 130,488,812.80/13,155.74
  6. Step 6: Final answer
    x = 9,918.77

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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.