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Finding the Fourth Proportional to 734.16, 1,013.40 and 439.60

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Solution

The fourth proportional to 734.16, 1,013.40 and 439.60 is: 606.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    734.16 : 1,013.40 = 439.60 : x
  2. Step 2: Convert to fraction form
    734.16/1,013.40 = 439.60/x
  3. Step 3: Cross multiply
    734.16x = 1,013.40 × 439.60
  4. Step 4: Simplify right side
    734.16x = 445,490.64
  5. Step 5: Solve for x
    x = 445,490.64/734.16
  6. Step 6: Final answer
    x = 606.80

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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.