Home / 1,261.76-1,890.18-612.92

Finding the Fourth Proportional to 1,261.76, 1,890.18 and 612.92

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Solution

The fourth proportional to 1,261.76, 1,890.18 and 612.92 is: 918.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.76 : 1,890.18 = 612.92 : x
  2. Step 2: Convert to fraction form
    1,261.76/1,890.18 = 612.92/x
  3. Step 3: Cross multiply
    1,261.76x = 1,890.18 × 612.92
  4. Step 4: Simplify right side
    1,261.76x = 1,158,529.13
  5. Step 5: Solve for x
    x = 1,158,529.13/1,261.76
  6. Step 6: Final answer
    x = 918.19

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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.