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Finding the Fourth Proportional to 1,656.89, 2,485.67 and 561.57

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Solution

The fourth proportional to 1,656.89, 2,485.67 and 561.57 is: 842.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,656.89 : 2,485.67 = 561.57 : x
  2. Step 2: Convert to fraction form
    1,656.89/2,485.67 = 561.57/x
  3. Step 3: Cross multiply
    1,656.89x = 2,485.67 × 561.57
  4. Step 4: Simplify right side
    1,656.89x = 1,395,874.89
  5. Step 5: Solve for x
    x = 1,395,874.89/1,656.89
  6. Step 6: Final answer
    x = 842.47

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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.