Home / 1,386.50-1,902.58-1,261.19

Finding the Fourth Proportional to 1,386.50, 1,902.58 and 1,261.19

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Solution

The fourth proportional to 1,386.50, 1,902.58 and 1,261.19 is: 1,730.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.50 : 1,902.58 = 1,261.19 : x
  2. Step 2: Convert to fraction form
    1,386.50/1,902.58 = 1,261.19/x
  3. Step 3: Cross multiply
    1,386.50x = 1,902.58 × 1,261.19
  4. Step 4: Simplify right side
    1,386.50x = 2,399,516.47
  5. Step 5: Solve for x
    x = 2,399,516.47/1,386.50
  6. Step 6: Final answer
    x = 1,730.63

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.