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Finding the Fourth Proportional to 1,395.60, 1,925.96 and 774.60

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Solution

The fourth proportional to 1,395.60, 1,925.96 and 774.60 is: 1,068.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,395.60 : 1,925.96 = 774.60 : x
  2. Step 2: Convert to fraction form
    1,395.60/1,925.96 = 774.60/x
  3. Step 3: Cross multiply
    1,395.60x = 1,925.96 × 774.60
  4. Step 4: Simplify right side
    1,395.60x = 1,491,848.62
  5. Step 5: Solve for x
    x = 1,491,848.62/1,395.60
  6. Step 6: Final answer
    x = 1,068.97

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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.