Home / 1,358.12-2,036.61-420.95

Finding the Fourth Proportional to 1,358.12, 2,036.61 and 420.95

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Solution

The fourth proportional to 1,358.12, 2,036.61 and 420.95 is: 631.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,358.12 : 2,036.61 = 420.95 : x
  2. Step 2: Convert to fraction form
    1,358.12/2,036.61 = 420.95/x
  3. Step 3: Cross multiply
    1,358.12x = 2,036.61 × 420.95
  4. Step 4: Simplify right side
    1,358.12x = 857,316.07
  5. Step 5: Solve for x
    x = 857,316.07/1,358.12
  6. Step 6: Final answer
    x = 631.25

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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.