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Finding the Fourth Proportional to 10,220.49, 15,309.18 and 4,678.49

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Solution

The fourth proportional to 10,220.49, 15,309.18 and 4,678.49 is: 7,007.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,220.49 : 15,309.18 = 4,678.49 : x
  2. Step 2: Convert to fraction form
    10,220.49/15,309.18 = 4,678.49/x
  3. Step 3: Cross multiply
    10,220.49x = 15,309.18 × 4,678.49
  4. Step 4: Simplify right side
    10,220.49x = 71,623,768.99
  5. Step 5: Solve for x
    x = 71,623,768.99/10,220.49
  6. Step 6: Final answer
    x = 7,007.86

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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.