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Finding the Fourth Proportional to 15,495.72, 21,384.72 and 8,781.72

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Solution

The fourth proportional to 15,495.72, 21,384.72 and 8,781.72 is: 12,119.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,495.72 : 21,384.72 = 8,781.72 : x
  2. Step 2: Convert to fraction form
    15,495.72/21,384.72 = 8,781.72/x
  3. Step 3: Cross multiply
    15,495.72x = 21,384.72 × 8,781.72
  4. Step 4: Simplify right side
    15,495.72x = 187,794,623.32
  5. Step 5: Solve for x
    x = 187,794,623.32/15,495.72
  6. Step 6: Final answer
    x = 12,119.13

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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.