Home / 1,315.80-1,972.44-545.76

Finding the Fourth Proportional to 1,315.80, 1,972.44 and 545.76

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Solution

The fourth proportional to 1,315.80, 1,972.44 and 545.76 is: 818.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.80 : 1,972.44 = 545.76 : x
  2. Step 2: Convert to fraction form
    1,315.80/1,972.44 = 545.76/x
  3. Step 3: Cross multiply
    1,315.80x = 1,972.44 × 545.76
  4. Step 4: Simplify right side
    1,315.80x = 1,076,478.85
  5. Step 5: Solve for x
    x = 1,076,478.85/1,315.80
  6. Step 6: Final answer
    x = 818.12

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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.