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Finding the Fourth Proportional to 1,323.75, 1,985.90 and 554.25

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Solution

The fourth proportional to 1,323.75, 1,985.90 and 554.25 is: 831.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,323.75 : 1,985.90 = 554.25 : x
  2. Step 2: Convert to fraction form
    1,323.75/1,985.90 = 554.25/x
  3. Step 3: Cross multiply
    1,323.75x = 1,985.90 × 554.25
  4. Step 4: Simplify right side
    1,323.75x = 1,100,685.08
  5. Step 5: Solve for x
    x = 1,100,685.08/1,323.75
  6. Step 6: Final answer
    x = 831.49

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.