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Finding the Fourth Proportional to 804.16, 1,205.16 and 438.40

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Solution

The fourth proportional to 804.16, 1,205.16 and 438.40 is: 657.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.16 : 1,205.16 = 438.40 : x
  2. Step 2: Convert to fraction form
    804.16/1,205.16 = 438.40/x
  3. Step 3: Cross multiply
    804.16x = 1,205.16 × 438.40
  4. Step 4: Simplify right side
    804.16x = 528,342.14
  5. Step 5: Solve for x
    x = 528,342.14/804.16
  6. Step 6: Final answer
    x = 657.01

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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.