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Finding the Fourth Proportional to 1,396.90, 1,927.72 and 775.90

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Solution

The fourth proportional to 1,396.90, 1,927.72 and 775.90 is: 1,070.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,396.90 : 1,927.72 = 775.90 : x
  2. Step 2: Convert to fraction form
    1,396.90/1,927.72 = 775.90/x
  3. Step 3: Cross multiply
    1,396.90x = 1,927.72 × 775.90
  4. Step 4: Simplify right side
    1,396.90x = 1,495,717.95
  5. Step 5: Solve for x
    x = 1,495,717.95/1,396.90
  6. Step 6: Final answer
    x = 1,070.74

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1.5x scale

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.