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Finding the Fourth Proportional to 1,019.51, 1,406.97 and 621.45

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Solution

The fourth proportional to 1,019.51, 1,406.97 and 621.45 is: 857.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,019.51 : 1,406.97 = 621.45 : x
  2. Step 2: Convert to fraction form
    1,019.51/1,406.97 = 621.45/x
  3. Step 3: Cross multiply
    1,019.51x = 1,406.97 × 621.45
  4. Step 4: Simplify right side
    1,019.51x = 874,361.51
  5. Step 5: Solve for x
    x = 874,361.51/1,019.51
  6. Step 6: Final answer
    x = 857.63

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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.