Home / 1,210.56-1,815.21-430.26

Finding the Fourth Proportional to 1,210.56, 1,815.21 and 430.26

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Solution

The fourth proportional to 1,210.56, 1,815.21 and 430.26 is: 645.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.56 : 1,815.21 = 430.26 : x
  2. Step 2: Convert to fraction form
    1,210.56/1,815.21 = 430.26/x
  3. Step 3: Cross multiply
    1,210.56x = 1,815.21 × 430.26
  4. Step 4: Simplify right side
    1,210.56x = 781,012.25
  5. Step 5: Solve for x
    x = 781,012.25/1,210.56
  6. Step 6: Final answer
    x = 645.17

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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.