Home / 13,140.70-18,133.50-7,172.32

Finding the Fourth Proportional to 13,140.70, 18,133.50 and 7,172.32

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Solution

The fourth proportional to 13,140.70, 18,133.50 and 7,172.32 is: 9,897.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,140.70 : 18,133.50 = 7,172.32 : x
  2. Step 2: Convert to fraction form
    13,140.70/18,133.50 = 7,172.32/x
  3. Step 3: Cross multiply
    13,140.70x = 18,133.50 × 7,172.32
  4. Step 4: Simplify right side
    13,140.70x = 130,059,264.72
  5. Step 5: Solve for x
    x = 130,059,264.72/13,140.70
  6. Step 6: Final answer
    x = 9,897.44

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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.