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Finding the Fourth Proportional to 874.79, 1,206.21 and 653.37

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Solution

The fourth proportional to 874.79, 1,206.21 and 653.37 is: 900.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.79 : 1,206.21 = 653.37 : x
  2. Step 2: Convert to fraction form
    874.79/1,206.21 = 653.37/x
  3. Step 3: Cross multiply
    874.79x = 1,206.21 × 653.37
  4. Step 4: Simplify right side
    874.79x = 788,103.06
  5. Step 5: Solve for x
    x = 788,103.06/874.79
  6. Step 6: Final answer
    x = 900.90

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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.