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Finding the Fourth Proportional to 938.46, 1,303.68 and 929.82

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Solution

The fourth proportional to 938.46, 1,303.68 and 929.82 is: 1,291.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.46 : 1,303.68 = 929.82 : x
  2. Step 2: Convert to fraction form
    938.46/1,303.68 = 929.82/x
  3. Step 3: Cross multiply
    938.46x = 1,303.68 × 929.82
  4. Step 4: Simplify right side
    938.46x = 1,212,187.74
  5. Step 5: Solve for x
    x = 1,212,187.74/938.46
  6. Step 6: Final answer
    x = 1,291.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.