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Finding the Fourth Proportional to 499.09, 688.67 and 278.01

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Solution

The fourth proportional to 499.09, 688.67 and 278.01 is: 383.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.09 : 688.67 = 278.01 : x
  2. Step 2: Convert to fraction form
    499.09/688.67 = 278.01/x
  3. Step 3: Cross multiply
    499.09x = 688.67 × 278.01
  4. Step 4: Simplify right side
    499.09x = 191,457.84
  5. Step 5: Solve for x
    x = 191,457.84/499.09
  6. Step 6: Final answer
    x = 383.62

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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.