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Finding the Fourth Proportional to 1,398.98, 1,930.77 and 903.06

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Solution

The fourth proportional to 1,398.98, 1,930.77 and 903.06 is: 1,246.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398.98 : 1,930.77 = 903.06 : x
  2. Step 2: Convert to fraction form
    1,398.98/1,930.77 = 903.06/x
  3. Step 3: Cross multiply
    1,398.98x = 1,930.77 × 903.06
  4. Step 4: Simplify right side
    1,398.98x = 1,743,601.16
  5. Step 5: Solve for x
    x = 1,743,601.16/1,398.98
  6. Step 6: Final answer
    x = 1,246.34

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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.