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Finding the Fourth Proportional to 720.19, 993.63 and 440.61

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Solution

The fourth proportional to 720.19, 993.63 and 440.61 is: 607.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.19 : 993.63 = 440.61 : x
  2. Step 2: Convert to fraction form
    720.19/993.63 = 440.61/x
  3. Step 3: Cross multiply
    720.19x = 993.63 × 440.61
  4. Step 4: Simplify right side
    720.19x = 437,803.31
  5. Step 5: Solve for x
    x = 437,803.31/720.19
  6. Step 6: Final answer
    x = 607.90

Related Problems

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Half scale
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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.