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Finding the Fourth Proportional to 501.18, 690.09 and 438.66

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Solution

The fourth proportional to 501.18, 690.09 and 438.66 is: 604.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    501.18 : 690.09 = 438.66 : x
  2. Step 2: Convert to fraction form
    501.18/690.09 = 438.66/x
  3. Step 3: Cross multiply
    501.18x = 690.09 × 438.66
  4. Step 4: Simplify right side
    501.18x = 302,714.88
  5. Step 5: Solve for x
    x = 302,714.88/501.18
  6. Step 6: Final answer
    x = 604.00

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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.