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Finding the Fourth Proportional to 1,398.15, 1,930.75 and 901.67

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Solution

The fourth proportional to 1,398.15, 1,930.75 and 901.67 is: 1,245.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398.15 : 1,930.75 = 901.67 : x
  2. Step 2: Convert to fraction form
    1,398.15/1,930.75 = 901.67/x
  3. Step 3: Cross multiply
    1,398.15x = 1,930.75 × 901.67
  4. Step 4: Simplify right side
    1,398.15x = 1,740,887.44
  5. Step 5: Solve for x
    x = 1,740,887.44/1,398.15
  6. Step 6: Final answer
    x = 1,245.14

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1.5x scale

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.