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Finding the Fourth Proportional to 1,938.39, 2,907.84 and 621.71

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Solution

The fourth proportional to 1,938.39, 2,907.84 and 621.71 is: 932.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,938.39 : 2,907.84 = 621.71 : x
  2. Step 2: Convert to fraction form
    1,938.39/2,907.84 = 621.71/x
  3. Step 3: Cross multiply
    1,938.39x = 2,907.84 × 621.71
  4. Step 4: Simplify right side
    1,938.39x = 1,807,818.67
  5. Step 5: Solve for x
    x = 1,807,818.67/1,938.39
  6. Step 6: Final answer
    x = 932.64

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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.