Home / 3,118.80-4,678.40-1,038.72

Finding the Fourth Proportional to 3,118.80, 4,678.40 and 1,038.72

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Solution

The fourth proportional to 3,118.80, 4,678.40 and 1,038.72 is: 1,558.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,118.80 : 4,678.40 = 1,038.72 : x
  2. Step 2: Convert to fraction form
    3,118.80/4,678.40 = 1,038.72/x
  3. Step 3: Cross multiply
    3,118.80x = 4,678.40 × 1,038.72
  4. Step 4: Simplify right side
    3,118.80x = 4,859,547.65
  5. Step 5: Solve for x
    x = 4,859,547.65/3,118.80
  6. Step 6: Final answer
    x = 1,558.15

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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.