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Finding the Fourth Proportional to 1,853.79, 2,780.22 and 621.17

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Solution

The fourth proportional to 1,853.79, 2,780.22 and 621.17 is: 931.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,853.79 : 2,780.22 = 621.17 : x
  2. Step 2: Convert to fraction form
    1,853.79/2,780.22 = 621.17/x
  3. Step 3: Cross multiply
    1,853.79x = 2,780.22 × 621.17
  4. Step 4: Simplify right side
    1,853.79x = 1,726,988.11
  5. Step 5: Solve for x
    x = 1,726,988.11/1,853.79
  6. Step 6: Final answer
    x = 931.60

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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.