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Finding the Fourth Proportional to 802.96, 1,205.79 and 438.01

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Solution

The fourth proportional to 802.96, 1,205.79 and 438.01 is: 657.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    802.96 : 1,205.79 = 438.01 : x
  2. Step 2: Convert to fraction form
    802.96/1,205.79 = 438.01/x
  3. Step 3: Cross multiply
    802.96x = 1,205.79 × 438.01
  4. Step 4: Simplify right side
    802.96x = 528,143.42
  5. Step 5: Solve for x
    x = 528,143.42/802.96
  6. Step 6: Final answer
    x = 657.74

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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.