Home / 1,345.25-2,017.89-420.95

Finding the Fourth Proportional to 1,345.25, 2,017.89 and 420.95

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Solution

The fourth proportional to 1,345.25, 2,017.89 and 420.95 is: 631.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,345.25 : 2,017.89 = 420.95 : x
  2. Step 2: Convert to fraction form
    1,345.25/2,017.89 = 420.95/x
  3. Step 3: Cross multiply
    1,345.25x = 2,017.89 × 420.95
  4. Step 4: Simplify right side
    1,345.25x = 849,435.84
  5. Step 5: Solve for x
    x = 849,435.84/1,345.25
  6. Step 6: Final answer
    x = 631.43

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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.