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Finding the Fourth Proportional to 1,989.03, 2,983.55 and 621.03

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Solution

The fourth proportional to 1,989.03, 2,983.55 and 621.03 is: 931.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,989.03 : 2,983.55 = 621.03 : x
  2. Step 2: Convert to fraction form
    1,989.03/2,983.55 = 621.03/x
  3. Step 3: Cross multiply
    1,989.03x = 2,983.55 × 621.03
  4. Step 4: Simplify right side
    1,989.03x = 1,852,874.06
  5. Step 5: Solve for x
    x = 1,852,874.06/1,989.03
  6. Step 6: Final answer
    x = 931.55

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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.