Home / 1,420.89-2,131.29-690.95

Finding the Fourth Proportional to 1,420.89, 2,131.29 and 690.95

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Solution

The fourth proportional to 1,420.89, 2,131.29 and 690.95 is: 1,036.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.89 : 2,131.29 = 690.95 : x
  2. Step 2: Convert to fraction form
    1,420.89/2,131.29 = 690.95/x
  3. Step 3: Cross multiply
    1,420.89x = 2,131.29 × 690.95
  4. Step 4: Simplify right side
    1,420.89x = 1,472,604.17
  5. Step 5: Solve for x
    x = 1,472,604.17/1,420.89
  6. Step 6: Final answer
    x = 1,036.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.