Home / 1,211.02-1,670.26-812.55

Finding the Fourth Proportional to 1,211.02, 1,670.26 and 812.55

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Solution

The fourth proportional to 1,211.02, 1,670.26 and 812.55 is: 1,120.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.02 : 1,670.26 = 812.55 : x
  2. Step 2: Convert to fraction form
    1,211.02/1,670.26 = 812.55/x
  3. Step 3: Cross multiply
    1,211.02x = 1,670.26 × 812.55
  4. Step 4: Simplify right side
    1,211.02x = 1,357,169.76
  5. Step 5: Solve for x
    x = 1,357,169.76/1,211.02
  6. Step 6: Final answer
    x = 1,120.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.