Home / 1,315.51-1,973.31-438.09

Finding the Fourth Proportional to 1,315.51, 1,973.31 and 438.09

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Solution

The fourth proportional to 1,315.51, 1,973.31 and 438.09 is: 657.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.51 : 1,973.31 = 438.09 : x
  2. Step 2: Convert to fraction form
    1,315.51/1,973.31 = 438.09/x
  3. Step 3: Cross multiply
    1,315.51x = 1,973.31 × 438.09
  4. Step 4: Simplify right side
    1,315.51x = 864,487.38
  5. Step 5: Solve for x
    x = 864,487.38/1,315.51
  6. Step 6: Final answer
    x = 657.15

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1.5x scale

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.