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Finding the Fourth Proportional to 278.83, 384.80 and 256.50

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Solution

The fourth proportional to 278.83, 384.80 and 256.50 is: 353.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.83 : 384.80 = 256.50 : x
  2. Step 2: Convert to fraction form
    278.83/384.80 = 256.50/x
  3. Step 3: Cross multiply
    278.83x = 384.80 × 256.50
  4. Step 4: Simplify right side
    278.83x = 98,701.20
  5. Step 5: Solve for x
    x = 98,701.20/278.83
  6. Step 6: Final answer
    x = 353.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.