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Finding the Fourth Proportional to 1,370.63, 1,891.51 and 749.63

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Solution

The fourth proportional to 1,370.63, 1,891.51 and 749.63 is: 1,034.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,370.63 : 1,891.51 = 749.63 : x
  2. Step 2: Convert to fraction form
    1,370.63/1,891.51 = 749.63/x
  3. Step 3: Cross multiply
    1,370.63x = 1,891.51 × 749.63
  4. Step 4: Simplify right side
    1,370.63x = 1,417,921.31
  5. Step 5: Solve for x
    x = 1,417,921.31/1,370.63
  6. Step 6: Final answer
    x = 1,034.51

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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.