Home / 1,575.86-2,175.12-1,078.38

Finding the Fourth Proportional to 1,575.86, 2,175.12 and 1,078.38

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Solution

The fourth proportional to 1,575.86, 2,175.12 and 1,078.38 is: 1,488.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,575.86 : 2,175.12 = 1,078.38 : x
  2. Step 2: Convert to fraction form
    1,575.86/2,175.12 = 1,078.38/x
  3. Step 3: Cross multiply
    1,575.86x = 2,175.12 × 1,078.38
  4. Step 4: Simplify right side
    1,575.86x = 2,345,605.91
  5. Step 5: Solve for x
    x = 2,345,605.91/1,575.86
  6. Step 6: Final answer
    x = 1,488.47

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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.