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Finding the Fourth Proportional to 665.01, 917.34 and 553.54

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Solution

The fourth proportional to 665.01, 917.34 and 553.54 is: 763.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.01 : 917.34 = 553.54 : x
  2. Step 2: Convert to fraction form
    665.01/917.34 = 553.54/x
  3. Step 3: Cross multiply
    665.01x = 917.34 × 553.54
  4. Step 4: Simplify right side
    665.01x = 507,779.80
  5. Step 5: Solve for x
    x = 507,779.80/665.01
  6. Step 6: Final answer
    x = 763.57

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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.