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Finding the Fourth Proportional to 1,021.28, 1,409.38 and 555.54

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Solution

The fourth proportional to 1,021.28, 1,409.38 and 555.54 is: 766.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.28 : 1,409.38 = 555.54 : x
  2. Step 2: Convert to fraction form
    1,021.28/1,409.38 = 555.54/x
  3. Step 3: Cross multiply
    1,021.28x = 1,409.38 × 555.54
  4. Step 4: Simplify right side
    1,021.28x = 782,966.97
  5. Step 5: Solve for x
    x = 782,966.97/1,021.28
  6. Step 6: Final answer
    x = 766.65

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1.5x scale

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.