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Finding the Fourth Proportional to 1,302.21, 1,953 and 652.80

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Solution

The fourth proportional to 1,302.21, 1,953 and 652.80 is: 979.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,302.21 : 1,953 = 652.80 : x
  2. Step 2: Convert to fraction form
    1,302.21/1,953 = 652.80/x
  3. Step 3: Cross multiply
    1,302.21x = 1,953 × 652.80
  4. Step 4: Simplify right side
    1,302.21x = 1,274,918.40
  5. Step 5: Solve for x
    x = 1,274,918.40/1,302.21
  6. Step 6: Final answer
    x = 979.04

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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.