Home / 1,678.16-2,518.40-813.04

Finding the Fourth Proportional to 1,678.16, 2,518.40 and 813.04

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Solution

The fourth proportional to 1,678.16, 2,518.40 and 813.04 is: 1,220.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,678.16 : 2,518.40 = 813.04 : x
  2. Step 2: Convert to fraction form
    1,678.16/2,518.40 = 813.04/x
  3. Step 3: Cross multiply
    1,678.16x = 2,518.40 × 813.04
  4. Step 4: Simplify right side
    1,678.16x = 2,047,559.94
  5. Step 5: Solve for x
    x = 2,047,559.94/1,678.16
  6. Step 6: Final answer
    x = 1,220.12

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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.