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Finding the Fourth Proportional to 1,205.21, 1,807.95 and 383.20

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Solution

The fourth proportional to 1,205.21, 1,807.95 and 383.20 is: 574.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,205.21 : 1,807.95 = 383.20 : x
  2. Step 2: Convert to fraction form
    1,205.21/1,807.95 = 383.20/x
  3. Step 3: Cross multiply
    1,205.21x = 1,807.95 × 383.20
  4. Step 4: Simplify right side
    1,205.21x = 692,803.36
  5. Step 5: Solve for x
    x = 692,803.36/1,205.21
  6. Step 6: Final answer
    x = 574.84

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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.