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Finding the Fourth Proportional to 15,490.80, 21,378.06 and 8,776.08

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Solution

The fourth proportional to 15,490.80, 21,378.06 and 8,776.08 is: 12,111.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,490.80 : 21,378.06 = 8,776.08 : x
  2. Step 2: Convert to fraction form
    15,490.80/21,378.06 = 8,776.08/x
  3. Step 3: Cross multiply
    15,490.80x = 21,378.06 × 8,776.08
  4. Step 4: Simplify right side
    15,490.80x = 187,615,564.80
  5. Step 5: Solve for x
    x = 187,615,564.80/15,490.80
  6. Step 6: Final answer
    x = 12,111.42

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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.