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Finding the Fourth Proportional to 10,990.50, 15,160.95 and 7,005.30

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Solution

The fourth proportional to 10,990.50, 15,160.95 and 7,005.30 is: 9,663.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,990.50 : 15,160.95 = 7,005.30 : x
  2. Step 2: Convert to fraction form
    10,990.50/15,160.95 = 7,005.30/x
  3. Step 3: Cross multiply
    10,990.50x = 15,160.95 × 7,005.30
  4. Step 4: Simplify right side
    10,990.50x = 106,207,003.04
  5. Step 5: Solve for x
    x = 106,207,003.04/10,990.50
  6. Step 6: Final answer
    x = 9,663.53

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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.