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Finding the Fourth Proportional to 15,018.30, 20,999.70 and 15,018.30

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Solution

The fourth proportional to 15,018.30, 20,999.70 and 15,018.30 is: 20,999.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,018.30 : 20,999.70 = 15,018.30 : x
  2. Step 2: Convert to fraction form
    15,018.30/20,999.70 = 15,018.30/x
  3. Step 3: Cross multiply
    15,018.30x = 20,999.70 × 15,018.30
  4. Step 4: Simplify right side
    15,018.30x = 315,379,794.51
  5. Step 5: Solve for x
    x = 315,379,794.51/15,018.30
  6. Step 6: Final answer
    x = 20,999.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.