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Finding the Fourth Proportional to 1,210.32, 1,812.29 and 980.09

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Solution

The fourth proportional to 1,210.32, 1,812.29 and 980.09 is: 1,467.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.32 : 1,812.29 = 980.09 : x
  2. Step 2: Convert to fraction form
    1,210.32/1,812.29 = 980.09/x
  3. Step 3: Cross multiply
    1,210.32x = 1,812.29 × 980.09
  4. Step 4: Simplify right side
    1,210.32x = 1,776,193.34
  5. Step 5: Solve for x
    x = 1,776,193.34/1,210.32
  6. Step 6: Final answer
    x = 1,467.54

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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.