Home / 1,310.16-1,815.80-1,285.55

Finding the Fourth Proportional to 1,310.16, 1,815.80 and 1,285.55

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Solution

The fourth proportional to 1,310.16, 1,815.80 and 1,285.55 is: 1,781.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,310.16 : 1,815.80 = 1,285.55 : x
  2. Step 2: Convert to fraction form
    1,310.16/1,815.80 = 1,285.55/x
  3. Step 3: Cross multiply
    1,310.16x = 1,815.80 × 1,285.55
  4. Step 4: Simplify right side
    1,310.16x = 2,334,312.03
  5. Step 5: Solve for x
    x = 2,334,312.03/1,310.16
  6. Step 6: Final answer
    x = 1,781.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.