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Finding the Fourth Proportional to 440.32, 607.64 and 309.84

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Solution

The fourth proportional to 440.32, 607.64 and 309.84 is: 427.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    440.32 : 607.64 = 309.84 : x
  2. Step 2: Convert to fraction form
    440.32/607.64 = 309.84/x
  3. Step 3: Cross multiply
    440.32x = 607.64 × 309.84
  4. Step 4: Simplify right side
    440.32x = 188,271.18
  5. Step 5: Solve for x
    x = 188,271.18/440.32
  6. Step 6: Final answer
    x = 427.58

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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.