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Finding the Fourth Proportional to 15,710.72, 21,681.21 and 8,541.12

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Solution

The fourth proportional to 15,710.72, 21,681.21 and 8,541.12 is: 11,786.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,710.72 : 21,681.21 = 8,541.12 : x
  2. Step 2: Convert to fraction form
    15,710.72/21,681.21 = 8,541.12/x
  3. Step 3: Cross multiply
    15,710.72x = 21,681.21 × 8,541.12
  4. Step 4: Simplify right side
    15,710.72x = 185,181,816.36
  5. Step 5: Solve for x
    x = 185,181,816.36/15,710.72
  6. Step 6: Final answer
    x = 11,786.98

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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.