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Finding the Fourth Proportional to 21,065.51, 31,570.94 and 8,570.99

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Solution

The fourth proportional to 21,065.51, 31,570.94 and 8,570.99 is: 12,845.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,065.51 : 31,570.94 = 8,570.99 : x
  2. Step 2: Convert to fraction form
    21,065.51/31,570.94 = 8,570.99/x
  3. Step 3: Cross multiply
    21,065.51x = 31,570.94 × 8,570.99
  4. Step 4: Simplify right side
    21,065.51x = 270,594,311.39
  5. Step 5: Solve for x
    x = 270,594,311.39/21,065.51
  6. Step 6: Final answer
    x = 12,845.37

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.