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Finding the Fourth Proportional to 15,318.20, 21,135.93 and 9,027.20

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Solution

The fourth proportional to 15,318.20, 21,135.93 and 9,027.20 is: 12,455.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,318.20 : 21,135.93 = 9,027.20 : x
  2. Step 2: Convert to fraction form
    15,318.20/21,135.93 = 9,027.20/x
  3. Step 3: Cross multiply
    15,318.20x = 21,135.93 × 9,027.20
  4. Step 4: Simplify right side
    15,318.20x = 190,798,267.30
  5. Step 5: Solve for x
    x = 190,798,267.30/15,318.20
  6. Step 6: Final answer
    x = 12,455.66

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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.