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Finding the Fourth Proportional to 15,690.80, 23,536.20 and 9,129.80

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Solution

The fourth proportional to 15,690.80, 23,536.20 and 9,129.80 is: 13,694.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,690.80 : 23,536.20 = 9,129.80 : x
  2. Step 2: Convert to fraction form
    15,690.80/23,536.20 = 9,129.80/x
  3. Step 3: Cross multiply
    15,690.80x = 23,536.20 × 9,129.80
  4. Step 4: Simplify right side
    15,690.80x = 214,880,798.76
  5. Step 5: Solve for x
    x = 214,880,798.76/15,690.80
  6. Step 6: Final answer
    x = 13,694.70

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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.