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Finding the Fourth Proportional to 1,570.64, 2,355.21 and 645.44

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Solution

The fourth proportional to 1,570.64, 2,355.21 and 645.44 is: 967.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,570.64 : 2,355.21 = 645.44 : x
  2. Step 2: Convert to fraction form
    1,570.64/2,355.21 = 645.44/x
  3. Step 3: Cross multiply
    1,570.64x = 2,355.21 × 645.44
  4. Step 4: Simplify right side
    1,570.64x = 1,520,134.97
  5. Step 5: Solve for x
    x = 1,520,134.97/1,570.64
  6. Step 6: Final answer
    x = 967.85

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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.