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Finding the Fourth Proportional to 632.20, 939.14 and 621.40

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Solution

The fourth proportional to 632.20, 939.14 and 621.40 is: 923.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    632.20 : 939.14 = 621.40 : x
  2. Step 2: Convert to fraction form
    632.20/939.14 = 621.40/x
  3. Step 3: Cross multiply
    632.20x = 939.14 × 621.40
  4. Step 4: Simplify right side
    632.20x = 583,581.60
  5. Step 5: Solve for x
    x = 583,581.60/632.20
  6. Step 6: Final answer
    x = 923.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.