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Finding the Fourth Proportional to 501.48, 690.03 and 486.45

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Solution

The fourth proportional to 501.48, 690.03 and 486.45 is: 669.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    501.48 : 690.03 = 486.45 : x
  2. Step 2: Convert to fraction form
    501.48/690.03 = 486.45/x
  3. Step 3: Cross multiply
    501.48x = 690.03 × 486.45
  4. Step 4: Simplify right side
    501.48x = 335,665.09
  5. Step 5: Solve for x
    x = 335,665.09/501.48
  6. Step 6: Final answer
    x = 669.35

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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.