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Finding the Fourth Proportional to 938.66, 1,298.43 and 730.89

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Solution

The fourth proportional to 938.66, 1,298.43 and 730.89 is: 1,011.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.66 : 1,298.43 = 730.89 : x
  2. Step 2: Convert to fraction form
    938.66/1,298.43 = 730.89/x
  3. Step 3: Cross multiply
    938.66x = 1,298.43 × 730.89
  4. Step 4: Simplify right side
    938.66x = 949,009.50
  5. Step 5: Solve for x
    x = 949,009.50/938.66
  6. Step 6: Final answer
    x = 1,011.03

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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.