Home / 10,257.60-15,386.40-7,147.20

Finding the Fourth Proportional to 10,257.60, 15,386.40 and 7,147.20

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Solution

The fourth proportional to 10,257.60, 15,386.40 and 7,147.20 is: 10,720.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,257.60 : 15,386.40 = 7,147.20 : x
  2. Step 2: Convert to fraction form
    10,257.60/15,386.40 = 7,147.20/x
  3. Step 3: Cross multiply
    10,257.60x = 15,386.40 × 7,147.20
  4. Step 4: Simplify right side
    10,257.60x = 109,969,678.08
  5. Step 5: Solve for x
    x = 109,969,678.08/10,257.60
  6. Step 6: Final answer
    x = 10,720.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.