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Finding the Fourth Proportional to 1,007.51, 1,390.32 and 553.25

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Solution

The fourth proportional to 1,007.51, 1,390.32 and 553.25 is: 763.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.51 : 1,390.32 = 553.25 : x
  2. Step 2: Convert to fraction form
    1,007.51/1,390.32 = 553.25/x
  3. Step 3: Cross multiply
    1,007.51x = 1,390.32 × 553.25
  4. Step 4: Simplify right side
    1,007.51x = 769,198.02
  5. Step 5: Solve for x
    x = 769,198.02/1,007.51
  6. Step 6: Final answer
    x = 763.47

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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.