Home / 1,315.23-1,973.06-390.66

Finding the Fourth Proportional to 1,315.23, 1,973.06 and 390.66

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Solution

The fourth proportional to 1,315.23, 1,973.06 and 390.66 is: 586.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.23 : 1,973.06 = 390.66 : x
  2. Step 2: Convert to fraction form
    1,315.23/1,973.06 = 390.66/x
  3. Step 3: Cross multiply
    1,315.23x = 1,973.06 × 390.66
  4. Step 4: Simplify right side
    1,315.23x = 770,793.67
  5. Step 5: Solve for x
    x = 770,793.67/1,315.23
  6. Step 6: Final answer
    x = 586.05

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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.