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Finding the Fourth Proportional to 896.64, 1,237.50 and 645.40

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Solution

The fourth proportional to 896.64, 1,237.50 and 645.40 is: 890.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    896.64 : 1,237.50 = 645.40 : x
  2. Step 2: Convert to fraction form
    896.64/1,237.50 = 645.40/x
  3. Step 3: Cross multiply
    896.64x = 1,237.50 × 645.40
  4. Step 4: Simplify right side
    896.64x = 798,681.73
  5. Step 5: Solve for x
    x = 798,681.73/896.64
  6. Step 6: Final answer
    x = 890.75

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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.