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Finding the Fourth Proportional to 731.78, 1,009.94 and 417.12

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Solution

The fourth proportional to 731.78, 1,009.94 and 417.12 is: 575.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    731.78 : 1,009.94 = 417.12 : x
  2. Step 2: Convert to fraction form
    731.78/1,009.94 = 417.12/x
  3. Step 3: Cross multiply
    731.78x = 1,009.94 × 417.12
  4. Step 4: Simplify right side
    731.78x = 421,261.12
  5. Step 5: Solve for x
    x = 421,261.12/731.78
  6. Step 6: Final answer
    x = 575.67

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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.