Home / 1,780.19-2,456.90-1,072.40

Finding the Fourth Proportional to 1,780.19, 2,456.90 and 1,072.40

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Solution

The fourth proportional to 1,780.19, 2,456.90 and 1,072.40 is: 1,480.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,780.19 : 2,456.90 = 1,072.40 : x
  2. Step 2: Convert to fraction form
    1,780.19/2,456.90 = 1,072.40/x
  3. Step 3: Cross multiply
    1,780.19x = 2,456.90 × 1,072.40
  4. Step 4: Simplify right side
    1,780.19x = 2,634,780.34
  5. Step 5: Solve for x
    x = 2,634,780.34/1,780.19
  6. Step 6: Final answer
    x = 1,480.05

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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.