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Finding the Fourth Proportional to 1,657.40, 2,486.40 and 561.86

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Solution

The fourth proportional to 1,657.40, 2,486.40 and 561.86 is: 842.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,657.40 : 2,486.40 = 561.86 : x
  2. Step 2: Convert to fraction form
    1,657.40/2,486.40 = 561.86/x
  3. Step 3: Cross multiply
    1,657.40x = 2,486.40 × 561.86
  4. Step 4: Simplify right side
    1,657.40x = 1,397,008.70
  5. Step 5: Solve for x
    x = 1,397,008.70/1,657.40
  6. Step 6: Final answer
    x = 842.89

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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.