Home / 13,387.78-18,475.14-7,420.35

Finding the Fourth Proportional to 13,387.78, 18,475.14 and 7,420.35

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Solution

The fourth proportional to 13,387.78, 18,475.14 and 7,420.35 is: 10,240.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,387.78 : 18,475.14 = 7,420.35 : x
  2. Step 2: Convert to fraction form
    13,387.78/18,475.14 = 7,420.35/x
  3. Step 3: Cross multiply
    13,387.78x = 18,475.14 × 7,420.35
  4. Step 4: Simplify right side
    13,387.78x = 137,091,930.56
  5. Step 5: Solve for x
    x = 137,091,930.56/13,387.78
  6. Step 6: Final answer
    x = 10,240.08

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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.