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Finding the Fourth Proportional to 485.48, 670.02 and 278.52

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Solution

The fourth proportional to 485.48, 670.02 and 278.52 is: 384.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.48 : 670.02 = 278.52 : x
  2. Step 2: Convert to fraction form
    485.48/670.02 = 278.52/x
  3. Step 3: Cross multiply
    485.48x = 670.02 × 278.52
  4. Step 4: Simplify right side
    485.48x = 186,613.97
  5. Step 5: Solve for x
    x = 186,613.97/485.48
  6. Step 6: Final answer
    x = 384.39

Related Problems

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Double scale
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Similar ratio
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1.5x scale

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.