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Finding the Fourth Proportional to 1,321.50, 1,981.61 and 627.74

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Solution

The fourth proportional to 1,321.50, 1,981.61 and 627.74 is: 941.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.50 : 1,981.61 = 627.74 : x
  2. Step 2: Convert to fraction form
    1,321.50/1,981.61 = 627.74/x
  3. Step 3: Cross multiply
    1,321.50x = 1,981.61 × 627.74
  4. Step 4: Simplify right side
    1,321.50x = 1,243,935.86
  5. Step 5: Solve for x
    x = 1,243,935.86/1,321.50
  6. Step 6: Final answer
    x = 941.31

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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.