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Finding the Fourth Proportional to 15,720.58, 21,693.93 and 8,647.00

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Solution

The fourth proportional to 15,720.58, 21,693.93 and 8,647.00 is: 11,932.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,720.58 : 21,693.93 = 8,647.00 : x
  2. Step 2: Convert to fraction form
    15,720.58/21,693.93 = 8,647.00/x
  3. Step 3: Cross multiply
    15,720.58x = 21,693.93 × 8,647.00
  4. Step 4: Simplify right side
    15,720.58x = 187,587,448.08
  5. Step 5: Solve for x
    x = 187,587,448.08/15,720.58
  6. Step 6: Final answer
    x = 11,932.60

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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.