Home / 13,155.02-18,154.33-7,187.08

Finding the Fourth Proportional to 13,155.02, 18,154.33 and 7,187.08

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Solution

The fourth proportional to 13,155.02, 18,154.33 and 7,187.08 is: 9,918.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,155.02 : 18,154.33 = 7,187.08 : x
  2. Step 2: Convert to fraction form
    13,155.02/18,154.33 = 7,187.08/x
  3. Step 3: Cross multiply
    13,155.02x = 18,154.33 × 7,187.08
  4. Step 4: Simplify right side
    13,155.02x = 130,476,558.70
  5. Step 5: Solve for x
    x = 130,476,558.70/13,155.02
  6. Step 6: Final answer
    x = 9,918.38

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Double scale
Find fourth proportional to 13,156.02, 18,155.71 and 7,188.08
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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.