Home / 13,139.69-18,133.02-7,171.88

Finding the Fourth Proportional to 13,139.69, 18,133.02 and 7,171.88

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Solution

The fourth proportional to 13,139.69, 18,133.02 and 7,171.88 is: 9,897.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,139.69 : 18,133.02 = 7,171.88 : x
  2. Step 2: Convert to fraction form
    13,139.69/18,133.02 = 7,171.88/x
  3. Step 3: Cross multiply
    13,139.69x = 18,133.02 × 7,171.88
  4. Step 4: Simplify right side
    13,139.69x = 130,047,752.81
  5. Step 5: Solve for x
    x = 130,047,752.81/13,139.69
  6. Step 6: Final answer
    x = 9,897.33

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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.