Home / 13,389.66-18,478.62-7,421.58

Finding the Fourth Proportional to 13,389.66, 18,478.62 and 7,421.58

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Solution

The fourth proportional to 13,389.66, 18,478.62 and 7,421.58 is: 10,242.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,389.66 : 18,478.62 = 7,421.58 : x
  2. Step 2: Convert to fraction form
    13,389.66/18,478.62 = 7,421.58/x
  3. Step 3: Cross multiply
    13,389.66x = 18,478.62 × 7,421.58
  4. Step 4: Simplify right side
    13,389.66x = 137,140,556.62
  5. Step 5: Solve for x
    x = 137,140,556.62/13,389.66
  6. Step 6: Final answer
    x = 10,242.27

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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.