Home / 1,210.43-1,815.75-430.35

Finding the Fourth Proportional to 1,210.43, 1,815.75 and 430.35

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Solution

The fourth proportional to 1,210.43, 1,815.75 and 430.35 is: 645.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.43 : 1,815.75 = 430.35 : x
  2. Step 2: Convert to fraction form
    1,210.43/1,815.75 = 430.35/x
  3. Step 3: Cross multiply
    1,210.43x = 1,815.75 × 430.35
  4. Step 4: Simplify right side
    1,210.43x = 781,408.01
  5. Step 5: Solve for x
    x = 781,408.01/1,210.43
  6. Step 6: Final answer
    x = 645.56

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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.