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Finding the Fourth Proportional to 802.65, 1,203.94 and 438.15

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Solution

The fourth proportional to 802.65, 1,203.94 and 438.15 is: 657.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    802.65 : 1,203.94 = 438.15 : x
  2. Step 2: Convert to fraction form
    802.65/1,203.94 = 438.15/x
  3. Step 3: Cross multiply
    802.65x = 1,203.94 × 438.15
  4. Step 4: Simplify right side
    802.65x = 527,506.31
  5. Step 5: Solve for x
    x = 527,506.31/802.65
  6. Step 6: Final answer
    x = 657.21

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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.