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Finding the Fourth Proportional to 9,987.40, 15,009.90 and 8,720.20

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Solution

The fourth proportional to 9,987.40, 15,009.90 and 8,720.20 is: 13,105.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,987.40 : 15,009.90 = 8,720.20 : x
  2. Step 2: Convert to fraction form
    9,987.40/15,009.90 = 8,720.20/x
  3. Step 3: Cross multiply
    9,987.40x = 15,009.90 × 8,720.20
  4. Step 4: Simplify right side
    9,987.40x = 130,889,329.98
  5. Step 5: Solve for x
    x = 130,889,329.98/9,987.40
  6. Step 6: Final answer
    x = 13,105.45

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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.