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Finding the Fourth Proportional to 856.02, 1,283.74 and 278.76

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Solution

The fourth proportional to 856.02, 1,283.74 and 278.76 is: 418.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.02 : 1,283.74 = 278.76 : x
  2. Step 2: Convert to fraction form
    856.02/1,283.74 = 278.76/x
  3. Step 3: Cross multiply
    856.02x = 1,283.74 × 278.76
  4. Step 4: Simplify right side
    856.02x = 357,855.36
  5. Step 5: Solve for x
    x = 357,855.36/856.02
  6. Step 6: Final answer
    x = 418.05

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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.