Home / 1,420.12-2,130.12-394.12

Finding the Fourth Proportional to 1,420.12, 2,130.12 and 394.12

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Solution

The fourth proportional to 1,420.12, 2,130.12 and 394.12 is: 591.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.12 : 2,130.12 = 394.12 : x
  2. Step 2: Convert to fraction form
    1,420.12/2,130.12 = 394.12/x
  3. Step 3: Cross multiply
    1,420.12x = 2,130.12 × 394.12
  4. Step 4: Simplify right side
    1,420.12x = 839,522.89
  5. Step 5: Solve for x
    x = 839,522.89/1,420.12
  6. Step 6: Final answer
    x = 591.16

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Double scale
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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.