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Finding the Fourth Proportional to 665.17, 917.66 and 429.08

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Solution

The fourth proportional to 665.17, 917.66 and 429.08 is: 591.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.17 : 917.66 = 429.08 : x
  2. Step 2: Convert to fraction form
    665.17/917.66 = 429.08/x
  3. Step 3: Cross multiply
    665.17x = 917.66 × 429.08
  4. Step 4: Simplify right side
    665.17x = 393,747.41
  5. Step 5: Solve for x
    x = 393,747.41/665.17
  6. Step 6: Final answer
    x = 591.95

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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.