Home / 13,140.16-18,133.80-7,172.21

Finding the Fourth Proportional to 13,140.16, 18,133.80 and 7,172.21

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Solution

The fourth proportional to 13,140.16, 18,133.80 and 7,172.21 is: 9,897.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,140.16 : 18,133.80 = 7,172.21 : x
  2. Step 2: Convert to fraction form
    13,140.16/18,133.80 = 7,172.21/x
  3. Step 3: Cross multiply
    13,140.16x = 18,133.80 × 7,172.21
  4. Step 4: Simplify right side
    13,140.16x = 130,059,421.70
  5. Step 5: Solve for x
    x = 130,059,421.70/13,140.16
  6. Step 6: Final answer
    x = 9,897.86

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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.