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Finding the Fourth Proportional to 855.60, 1,283.72 and 307.76

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Solution

The fourth proportional to 855.60, 1,283.72 and 307.76 is: 461.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.60 : 1,283.72 = 307.76 : x
  2. Step 2: Convert to fraction form
    855.60/1,283.72 = 307.76/x
  3. Step 3: Cross multiply
    855.60x = 1,283.72 × 307.76
  4. Step 4: Simplify right side
    855.60x = 395,077.67
  5. Step 5: Solve for x
    x = 395,077.67/855.60
  6. Step 6: Final answer
    x = 461.76

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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.