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Finding the Fourth Proportional to 5,221.56, 7,830.70 and 1,758

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Solution

The fourth proportional to 5,221.56, 7,830.70 and 1,758 is: 2,636.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,221.56 : 7,830.70 = 1,758 : x
  2. Step 2: Convert to fraction form
    5,221.56/7,830.70 = 1,758/x
  3. Step 3: Cross multiply
    5,221.56x = 7,830.70 × 1,758
  4. Step 4: Simplify right side
    5,221.56x = 13,766,370.60
  5. Step 5: Solve for x
    x = 13,766,370.60/5,221.56
  6. Step 6: Final answer
    x = 2,636.45

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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.