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Finding the Fourth Proportional to 1,210.59, 1,814.27 and 690.75

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Solution

The fourth proportional to 1,210.59, 1,814.27 and 690.75 is: 1,035.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.59 : 1,814.27 = 690.75 : x
  2. Step 2: Convert to fraction form
    1,210.59/1,814.27 = 690.75/x
  3. Step 3: Cross multiply
    1,210.59x = 1,814.27 × 690.75
  4. Step 4: Simplify right side
    1,210.59x = 1,253,203.55
  5. Step 5: Solve for x
    x = 1,253,203.55/1,210.59
  6. Step 6: Final answer
    x = 1,035.20

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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.