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Finding the Fourth Proportional to 855.76, 1,283.37 and 278.50

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Solution

The fourth proportional to 855.76, 1,283.37 and 278.50 is: 417.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.76 : 1,283.37 = 278.50 : x
  2. Step 2: Convert to fraction form
    855.76/1,283.37 = 278.50/x
  3. Step 3: Cross multiply
    855.76x = 1,283.37 × 278.50
  4. Step 4: Simplify right side
    855.76x = 357,417.15
  5. Step 5: Solve for x
    x = 357,417.15/855.76
  6. Step 6: Final answer
    x = 417.66

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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.