Home / 13,155.79-18,154.76-7,187.31

Finding the Fourth Proportional to 13,155.79, 18,154.76 and 7,187.31

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Solution

The fourth proportional to 13,155.79, 18,154.76 and 7,187.31 is: 9,918.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,155.79 : 18,154.76 = 7,187.31 : x
  2. Step 2: Convert to fraction form
    13,155.79/18,154.76 = 7,187.31/x
  3. Step 3: Cross multiply
    13,155.79x = 18,154.76 × 7,187.31
  4. Step 4: Simplify right side
    13,155.79x = 130,483,797.32
  5. Step 5: Solve for x
    x = 130,483,797.32/13,155.79
  6. Step 6: Final answer
    x = 9,918.36

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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.