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Finding the Fourth Proportional to 720.15, 993.54 and 440.19

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Solution

The fourth proportional to 720.15, 993.54 and 440.19 is: 607.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.15 : 993.54 = 440.19 : x
  2. Step 2: Convert to fraction form
    720.15/993.54 = 440.19/x
  3. Step 3: Cross multiply
    720.15x = 993.54 × 440.19
  4. Step 4: Simplify right side
    720.15x = 437,346.37
  5. Step 5: Solve for x
    x = 437,346.37/720.15
  6. Step 6: Final answer
    x = 607.30

Related Problems

Find fourth proportional to 360.08, 496.77 and 220.10
Half scale
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Double scale
Find fourth proportional to 721.15, 994.92 and 441.19
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.