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Finding the Fourth Proportional to 2,670.02, 4,005.70 and 821.06

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Solution

The fourth proportional to 2,670.02, 4,005.70 and 821.06 is: 1,231.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,670.02 : 4,005.70 = 821.06 : x
  2. Step 2: Convert to fraction form
    2,670.02/4,005.70 = 821.06/x
  3. Step 3: Cross multiply
    2,670.02x = 4,005.70 × 821.06
  4. Step 4: Simplify right side
    2,670.02x = 3,288,920.04
  5. Step 5: Solve for x
    x = 3,288,920.04/2,670.02
  6. Step 6: Final answer
    x = 1,231.80

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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.