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Finding the Fourth Proportional to 1,021.59, 1,409.81 and 555.84

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Solution

The fourth proportional to 1,021.59, 1,409.81 and 555.84 is: 767.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.59 : 1,409.81 = 555.84 : x
  2. Step 2: Convert to fraction form
    1,021.59/1,409.81 = 555.84/x
  3. Step 3: Cross multiply
    1,021.59x = 1,409.81 × 555.84
  4. Step 4: Simplify right side
    1,021.59x = 783,626.01
  5. Step 5: Solve for x
    x = 783,626.01/1,021.59
  6. Step 6: Final answer
    x = 767.07

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.