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Finding the Fourth Proportional to 1,611.70, 2,417.90 and 571.76

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Solution

The fourth proportional to 1,611.70, 2,417.90 and 571.76 is: 857.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,611.70 : 2,417.90 = 571.76 : x
  2. Step 2: Convert to fraction form
    1,611.70/2,417.90 = 571.76/x
  3. Step 3: Cross multiply
    1,611.70x = 2,417.90 × 571.76
  4. Step 4: Simplify right side
    1,611.70x = 1,382,455.84
  5. Step 5: Solve for x
    x = 1,382,455.84/1,611.70
  6. Step 6: Final answer
    x = 857.76

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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.