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Finding the Fourth Proportional to 985.72, 1,478.58 and 336.46

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Solution

The fourth proportional to 985.72, 1,478.58 and 336.46 is: 504.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.72 : 1,478.58 = 336.46 : x
  2. Step 2: Convert to fraction form
    985.72/1,478.58 = 336.46/x
  3. Step 3: Cross multiply
    985.72x = 1,478.58 × 336.46
  4. Step 4: Simplify right side
    985.72x = 497,475.63
  5. Step 5: Solve for x
    x = 497,475.63/985.72
  6. Step 6: Final answer
    x = 504.68

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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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.