Home / 1,261.95-1,890.18-611.32

Finding the Fourth Proportional to 1,261.95, 1,890.18 and 611.32

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Solution

The fourth proportional to 1,261.95, 1,890.18 and 611.32 is: 915.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.95 : 1,890.18 = 611.32 : x
  2. Step 2: Convert to fraction form
    1,261.95/1,890.18 = 611.32/x
  3. Step 3: Cross multiply
    1,261.95x = 1,890.18 × 611.32
  4. Step 4: Simplify right side
    1,261.95x = 1,155,495.39
  5. Step 5: Solve for x
    x = 1,155,495.39/1,261.95
  6. Step 6: Final answer
    x = 915.65

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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.