Home / 13,145.40-18,140.71-7,177.20

Finding the Fourth Proportional to 13,145.40, 18,140.71 and 7,177.20

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Solution

The fourth proportional to 13,145.40, 18,140.71 and 7,177.20 is: 9,904.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,145.40 : 18,140.71 = 7,177.20 : x
  2. Step 2: Convert to fraction form
    13,145.40/18,140.71 = 7,177.20/x
  3. Step 3: Cross multiply
    13,145.40x = 18,140.71 × 7,177.20
  4. Step 4: Simplify right side
    13,145.40x = 130,199,503.81
  5. Step 5: Solve for x
    x = 130,199,503.81/13,145.40
  6. Step 6: Final answer
    x = 9,904.57

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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.