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Finding the Fourth Proportional to 1,491.93, 2,058.90 and 828.75

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Solution

The fourth proportional to 1,491.93, 2,058.90 and 828.75 is: 1,143.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,491.93 : 2,058.90 = 828.75 : x
  2. Step 2: Convert to fraction form
    1,491.93/2,058.90 = 828.75/x
  3. Step 3: Cross multiply
    1,491.93x = 2,058.90 × 828.75
  4. Step 4: Simplify right side
    1,491.93x = 1,706,313.38
  5. Step 5: Solve for x
    x = 1,706,313.38/1,491.93
  6. Step 6: Final answer
    x = 1,143.70

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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.