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Finding the Fourth Proportional to 1,205.42, 1,808.40 and 383.74

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Solution

The fourth proportional to 1,205.42, 1,808.40 and 383.74 is: 575.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,205.42 : 1,808.40 = 383.74 : x
  2. Step 2: Convert to fraction form
    1,205.42/1,808.40 = 383.74/x
  3. Step 3: Cross multiply
    1,205.42x = 1,808.40 × 383.74
  4. Step 4: Simplify right side
    1,205.42x = 693,955.42
  5. Step 5: Solve for x
    x = 693,955.42/1,205.42
  6. Step 6: Final answer
    x = 575.70

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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.