Home / 1,316.45-1,815.40-1,021.61

Finding the Fourth Proportional to 1,316.45, 1,815.40 and 1,021.61

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Solution

The fourth proportional to 1,316.45, 1,815.40 and 1,021.61 is: 1,408.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,316.45 : 1,815.40 = 1,021.61 : x
  2. Step 2: Convert to fraction form
    1,316.45/1,815.40 = 1,021.61/x
  3. Step 3: Cross multiply
    1,316.45x = 1,815.40 × 1,021.61
  4. Step 4: Simplify right side
    1,316.45x = 1,854,630.79
  5. Step 5: Solve for x
    x = 1,854,630.79/1,316.45
  6. Step 6: Final answer
    x = 1,408.81

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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.