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Finding the Fourth Proportional to 1,907.71, 2,856.70 and 931.25

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Solution

The fourth proportional to 1,907.71, 2,856.70 and 931.25 is: 1,394.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,907.71 : 2,856.70 = 931.25 : x
  2. Step 2: Convert to fraction form
    1,907.71/2,856.70 = 931.25/x
  3. Step 3: Cross multiply
    1,907.71x = 2,856.70 × 931.25
  4. Step 4: Simplify right side
    1,907.71x = 2,660,297.22
  5. Step 5: Solve for x
    x = 2,660,297.22/1,907.71
  6. Step 6: Final answer
    x = 1,394.50

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1.5x scale

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.