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Finding the Fourth Proportional to 1,214.48, 1,821.67 and 659.45

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Solution

The fourth proportional to 1,214.48, 1,821.67 and 659.45 is: 989.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,214.48 : 1,821.67 = 659.45 : x
  2. Step 2: Convert to fraction form
    1,214.48/1,821.67 = 659.45/x
  3. Step 3: Cross multiply
    1,214.48x = 1,821.67 × 659.45
  4. Step 4: Simplify right side
    1,214.48x = 1,201,303.19
  5. Step 5: Solve for x
    x = 1,201,303.19/1,214.48
  6. Step 6: Final answer
    x = 989.15

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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.