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Finding the Fourth Proportional to 485.53, 670.01 and 278.53

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Solution

The fourth proportional to 485.53, 670.01 and 278.53 is: 384.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.53 : 670.01 = 278.53 : x
  2. Step 2: Convert to fraction form
    485.53/670.01 = 278.53/x
  3. Step 3: Cross multiply
    485.53x = 670.01 × 278.53
  4. Step 4: Simplify right side
    485.53x = 186,616.49
  5. Step 5: Solve for x
    x = 186,616.49/485.53
  6. Step 6: Final answer
    x = 384.36

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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.