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Finding the Fourth Proportional to 855.02, 1,282.41 and 307.12

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Solution

The fourth proportional to 855.02, 1,282.41 and 307.12 is: 460.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.02 : 1,282.41 = 307.12 : x
  2. Step 2: Convert to fraction form
    855.02/1,282.41 = 307.12/x
  3. Step 3: Cross multiply
    855.02x = 1,282.41 × 307.12
  4. Step 4: Simplify right side
    855.02x = 393,853.76
  5. Step 5: Solve for x
    x = 393,853.76/855.02
  6. Step 6: Final answer
    x = 460.64

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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.