Home / 3,078.70-4,248.60-1,681.45

Finding the Fourth Proportional to 3,078.70, 4,248.60 and 1,681.45

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Solution

The fourth proportional to 3,078.70, 4,248.60 and 1,681.45 is: 2,320.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,078.70 : 4,248.60 = 1,681.45 : x
  2. Step 2: Convert to fraction form
    3,078.70/4,248.60 = 1,681.45/x
  3. Step 3: Cross multiply
    3,078.70x = 4,248.60 × 1,681.45
  4. Step 4: Simplify right side
    3,078.70x = 7,143,808.47
  5. Step 5: Solve for x
    x = 7,143,808.47/3,078.70
  6. Step 6: Final answer
    x = 2,320.40

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Half scale
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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.