Home / 13,388.40-18,475.80-7,420.08

Finding the Fourth Proportional to 13,388.40, 18,475.80 and 7,420.08

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Solution

The fourth proportional to 13,388.40, 18,475.80 and 7,420.08 is: 10,239.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,388.40 : 18,475.80 = 7,420.08 : x
  2. Step 2: Convert to fraction form
    13,388.40/18,475.80 = 7,420.08/x
  3. Step 3: Cross multiply
    13,388.40x = 18,475.80 × 7,420.08
  4. Step 4: Simplify right side
    13,388.40x = 137,091,914.06
  5. Step 5: Solve for x
    x = 137,091,914.06/13,388.40
  6. Step 6: Final answer
    x = 10,239.60

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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.