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Finding the Fourth Proportional to 665.64, 917.67 and 561.15

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Solution

The fourth proportional to 665.64, 917.67 and 561.15 is: 773.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.64 : 917.67 = 561.15 : x
  2. Step 2: Convert to fraction form
    665.64/917.67 = 561.15/x
  3. Step 3: Cross multiply
    665.64x = 917.67 × 561.15
  4. Step 4: Simplify right side
    665.64x = 514,950.52
  5. Step 5: Solve for x
    x = 514,950.52/665.64
  6. Step 6: Final answer
    x = 773.62

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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.