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Finding the Fourth Proportional to 1,681.92, 2,320.96 and 935.84

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Solution

The fourth proportional to 1,681.92, 2,320.96 and 935.84 is: 1,291.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,681.92 : 2,320.96 = 935.84 : x
  2. Step 2: Convert to fraction form
    1,681.92/2,320.96 = 935.84/x
  3. Step 3: Cross multiply
    1,681.92x = 2,320.96 × 935.84
  4. Step 4: Simplify right side
    1,681.92x = 2,172,047.21
  5. Step 5: Solve for x
    x = 2,172,047.21/1,681.92
  6. Step 6: Final answer
    x = 1,291.41

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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.