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Finding the Fourth Proportional to 1,320.64, 1,980.91 and 627.80

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Solution

The fourth proportional to 1,320.64, 1,980.91 and 627.80 is: 941.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.64 : 1,980.91 = 627.80 : x
  2. Step 2: Convert to fraction form
    1,320.64/1,980.91 = 627.80/x
  3. Step 3: Cross multiply
    1,320.64x = 1,980.91 × 627.80
  4. Step 4: Simplify right side
    1,320.64x = 1,243,612.16
  5. Step 5: Solve for x
    x = 1,243,612.16/1,320.64
  6. Step 6: Final answer
    x = 941.68

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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.