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Finding the Fourth Proportional to 665.76, 916.53 and 499.68

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Solution

The fourth proportional to 665.76, 916.53 and 499.68 is: 687.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.76 : 916.53 = 499.68 : x
  2. Step 2: Convert to fraction form
    665.76/916.53 = 499.68/x
  3. Step 3: Cross multiply
    665.76x = 916.53 × 499.68
  4. Step 4: Simplify right side
    665.76x = 457,971.71
  5. Step 5: Solve for x
    x = 457,971.71/665.76
  6. Step 6: Final answer
    x = 687.89

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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.