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Finding the Fourth Proportional to 1,913.71, 2,870.36 and 936.85

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Solution

The fourth proportional to 1,913.71, 2,870.36 and 936.85 is: 1,405.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,913.71 : 2,870.36 = 936.85 : x
  2. Step 2: Convert to fraction form
    1,913.71/2,870.36 = 936.85/x
  3. Step 3: Cross multiply
    1,913.71x = 2,870.36 × 936.85
  4. Step 4: Simplify right side
    1,913.71x = 2,689,077.73
  5. Step 5: Solve for x
    x = 2,689,077.73/1,913.71
  6. Step 6: Final answer
    x = 1,405.17

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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.