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Finding the Fourth Proportional to 1,395.25, 1,925.45 and 774.25

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Solution

The fourth proportional to 1,395.25, 1,925.45 and 774.25 is: 1,068.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,395.25 : 1,925.45 = 774.25 : x
  2. Step 2: Convert to fraction form
    1,395.25/1,925.45 = 774.25/x
  3. Step 3: Cross multiply
    1,395.25x = 1,925.45 × 774.25
  4. Step 4: Simplify right side
    1,395.25x = 1,490,779.66
  5. Step 5: Solve for x
    x = 1,490,779.66/1,395.25
  6. Step 6: Final answer
    x = 1,068.47

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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.