Home / 3,390.42-4,678.79-1,898.34

Finding the Fourth Proportional to 3,390.42, 4,678.79 and 1,898.34

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Solution

The fourth proportional to 3,390.42, 4,678.79 and 1,898.34 is: 2,619.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,390.42 : 4,678.79 = 1,898.34 : x
  2. Step 2: Convert to fraction form
    3,390.42/4,678.79 = 1,898.34/x
  3. Step 3: Cross multiply
    3,390.42x = 4,678.79 × 1,898.34
  4. Step 4: Simplify right side
    3,390.42x = 8,881,934.21
  5. Step 5: Solve for x
    x = 8,881,934.21/3,390.42
  6. Step 6: Final answer
    x = 2,619.72

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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.