Home / 1,345.13-2,017.70-420.74

Finding the Fourth Proportional to 1,345.13, 2,017.70 and 420.74

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Solution

The fourth proportional to 1,345.13, 2,017.70 and 420.74 is: 631.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,345.13 : 2,017.70 = 420.74 : x
  2. Step 2: Convert to fraction form
    1,345.13/2,017.70 = 420.74/x
  3. Step 3: Cross multiply
    1,345.13x = 2,017.70 × 420.74
  4. Step 4: Simplify right side
    1,345.13x = 848,930.04
  5. Step 5: Solve for x
    x = 848,930.04/1,345.13
  6. Step 6: Final answer
    x = 631.11

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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.