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Finding the Fourth Proportional to 1,021.55, 1,409.75 and 555.80

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Solution

The fourth proportional to 1,021.55, 1,409.75 and 555.80 is: 767.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.55 : 1,409.75 = 555.80 : x
  2. Step 2: Convert to fraction form
    1,021.55/1,409.75 = 555.80/x
  3. Step 3: Cross multiply
    1,021.55x = 1,409.75 × 555.80
  4. Step 4: Simplify right side
    1,021.55x = 783,539.05
  5. Step 5: Solve for x
    x = 783,539.05/1,021.55
  6. Step 6: Final answer
    x = 767.01

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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.