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Finding the Fourth Proportional to 1,396.76, 1,927.58 and 775.76

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Solution

The fourth proportional to 1,396.76, 1,927.58 and 775.76 is: 1,070.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,396.76 : 1,927.58 = 775.76 : x
  2. Step 2: Convert to fraction form
    1,396.76/1,927.58 = 775.76/x
  3. Step 3: Cross multiply
    1,396.76x = 1,927.58 × 775.76
  4. Step 4: Simplify right side
    1,396.76x = 1,495,339.46
  5. Step 5: Solve for x
    x = 1,495,339.46/1,396.76
  6. Step 6: Final answer
    x = 1,070.58

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Half scale
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Double scale
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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.