Home / 1,355.12-2,031.92-430.51

Finding the Fourth Proportional to 1,355.12, 2,031.92 and 430.51

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Solution

The fourth proportional to 1,355.12, 2,031.92 and 430.51 is: 645.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,355.12 : 2,031.92 = 430.51 : x
  2. Step 2: Convert to fraction form
    1,355.12/2,031.92 = 430.51/x
  3. Step 3: Cross multiply
    1,355.12x = 2,031.92 × 430.51
  4. Step 4: Simplify right side
    1,355.12x = 874,761.88
  5. Step 5: Solve for x
    x = 874,761.88/1,355.12
  6. Step 6: Final answer
    x = 645.52

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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.