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Finding the Fourth Proportional to 1,321.50, 1,981.86 and 627.48

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Solution

The fourth proportional to 1,321.50, 1,981.86 and 627.48 is: 941.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.50 : 1,981.86 = 627.48 : x
  2. Step 2: Convert to fraction form
    1,321.50/1,981.86 = 627.48/x
  3. Step 3: Cross multiply
    1,321.50x = 1,981.86 × 627.48
  4. Step 4: Simplify right side
    1,321.50x = 1,243,577.51
  5. Step 5: Solve for x
    x = 1,243,577.51/1,321.50
  6. Step 6: Final answer
    x = 941.03

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1.5x scale

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.