Home / 1,420.13-2,130.20-394.13

Finding the Fourth Proportional to 1,420.13, 2,130.20 and 394.13

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Solution

The fourth proportional to 1,420.13, 2,130.20 and 394.13 is: 591.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.13 : 2,130.20 = 394.13 : x
  2. Step 2: Convert to fraction form
    1,420.13/2,130.20 = 394.13/x
  3. Step 3: Cross multiply
    1,420.13x = 2,130.20 × 394.13
  4. Step 4: Simplify right side
    1,420.13x = 839,575.73
  5. Step 5: Solve for x
    x = 839,575.73/1,420.13
  6. Step 6: Final answer
    x = 591.20

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Double scale
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Similar ratio
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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.