Home / 1,319.67-1,818.90-1,258.20

Finding the Fourth Proportional to 1,319.67, 1,818.90 and 1,258.20

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Solution

The fourth proportional to 1,319.67, 1,818.90 and 1,258.20 is: 1,734.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.67 : 1,818.90 = 1,258.20 : x
  2. Step 2: Convert to fraction form
    1,319.67/1,818.90 = 1,258.20/x
  3. Step 3: Cross multiply
    1,319.67x = 1,818.90 × 1,258.20
  4. Step 4: Simplify right side
    1,319.67x = 2,288,539.98
  5. Step 5: Solve for x
    x = 2,288,539.98/1,319.67
  6. Step 6: Final answer
    x = 1,734.18

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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.