Home / 3,120.79-4,681.86-929.70

Finding the Fourth Proportional to 3,120.79, 4,681.86 and 929.70

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Solution

The fourth proportional to 3,120.79, 4,681.86 and 929.70 is: 1,394.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,120.79 : 4,681.86 = 929.70 : x
  2. Step 2: Convert to fraction form
    3,120.79/4,681.86 = 929.70/x
  3. Step 3: Cross multiply
    3,120.79x = 4,681.86 × 929.70
  4. Step 4: Simplify right side
    3,120.79x = 4,352,725.24
  5. Step 5: Solve for x
    x = 4,352,725.24/3,120.79
  6. Step 6: Final answer
    x = 1,394.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.