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Finding the Fourth Proportional to 15,784.16, 21,781.58 and 8,710.43

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Solution

The fourth proportional to 15,784.16, 21,781.58 and 8,710.43 is: 12,020.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,784.16 : 21,781.58 = 8,710.43 : x
  2. Step 2: Convert to fraction form
    15,784.16/21,781.58 = 8,710.43/x
  3. Step 3: Cross multiply
    15,784.16x = 21,781.58 × 8,710.43
  4. Step 4: Simplify right side
    15,784.16x = 189,726,938.78
  5. Step 5: Solve for x
    x = 189,726,938.78/15,784.16
  6. Step 6: Final answer
    x = 12,020.08

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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.