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Finding the Fourth Proportional to 10,388.90, 15,546.90 and 7,108.40

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Solution

The fourth proportional to 10,388.90, 15,546.90 and 7,108.40 is: 10,637.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,388.90 : 15,546.90 = 7,108.40 : x
  2. Step 2: Convert to fraction form
    10,388.90/15,546.90 = 7,108.40/x
  3. Step 3: Cross multiply
    10,388.90x = 15,546.90 × 7,108.40
  4. Step 4: Simplify right side
    10,388.90x = 110,513,583.96
  5. Step 5: Solve for x
    x = 110,513,583.96/10,388.90
  6. Step 6: Final answer
    x = 10,637.66

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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.