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Finding the Fourth Proportional to 665.42, 917.51 and 560.34

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Solution

The fourth proportional to 665.42, 917.51 and 560.34 is: 772.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.42 : 917.51 = 560.34 : x
  2. Step 2: Convert to fraction form
    665.42/917.51 = 560.34/x
  3. Step 3: Cross multiply
    665.42x = 917.51 × 560.34
  4. Step 4: Simplify right side
    665.42x = 514,121.25
  5. Step 5: Solve for x
    x = 514,121.25/665.42
  6. Step 6: Final answer
    x = 772.63

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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.