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Finding the Fourth Proportional to 1,210.80, 1,814.73 and 862.25

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Solution

The fourth proportional to 1,210.80, 1,814.73 and 862.25 is: 1,292.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.80 : 1,814.73 = 862.25 : x
  2. Step 2: Convert to fraction form
    1,210.80/1,814.73 = 862.25/x
  3. Step 3: Cross multiply
    1,210.80x = 1,814.73 × 862.25
  4. Step 4: Simplify right side
    1,210.80x = 1,564,741.87
  5. Step 5: Solve for x
    x = 1,564,741.87/1,210.80
  6. Step 6: Final answer
    x = 1,292.32

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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.