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Finding the Fourth Proportional to 1,021.66, 1,409.90 and 555.91

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Solution

The fourth proportional to 1,021.66, 1,409.90 and 555.91 is: 767.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.66 : 1,409.90 = 555.91 : x
  2. Step 2: Convert to fraction form
    1,021.66/1,409.90 = 555.91/x
  3. Step 3: Cross multiply
    1,021.66x = 1,409.90 × 555.91
  4. Step 4: Simplify right side
    1,021.66x = 783,777.51
  5. Step 5: Solve for x
    x = 783,777.51/1,021.66
  6. Step 6: Final answer
    x = 767.16

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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.