Home / 1,680.85-2,319.45-934.78

Finding the Fourth Proportional to 1,680.85, 2,319.45 and 934.78

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Solution

The fourth proportional to 1,680.85, 2,319.45 and 934.78 is: 1,289.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,680.85 : 2,319.45 = 934.78 : x
  2. Step 2: Convert to fraction form
    1,680.85/2,319.45 = 934.78/x
  3. Step 3: Cross multiply
    1,680.85x = 2,319.45 × 934.78
  4. Step 4: Simplify right side
    1,680.85x = 2,168,175.47
  5. Step 5: Solve for x
    x = 2,168,175.47/1,680.85
  6. Step 6: Final answer
    x = 1,289.93

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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.