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Finding the Fourth Proportional to 1,021.33, 1,409.43 and 555.58

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Solution

The fourth proportional to 1,021.33, 1,409.43 and 555.58 is: 766.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.33 : 1,409.43 = 555.58 : x
  2. Step 2: Convert to fraction form
    1,021.33/1,409.43 = 555.58/x
  3. Step 3: Cross multiply
    1,021.33x = 1,409.43 × 555.58
  4. Step 4: Simplify right side
    1,021.33x = 783,051.12
  5. Step 5: Solve for x
    x = 783,051.12/1,021.33
  6. Step 6: Final answer
    x = 766.70

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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.