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Finding the Fourth Proportional to 1,890.81, 2,840.31 and 1,275.71

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Solution

The fourth proportional to 1,890.81, 2,840.31 and 1,275.71 is: 1,916.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,890.81 : 2,840.31 = 1,275.71 : x
  2. Step 2: Convert to fraction form
    1,890.81/2,840.31 = 1,275.71/x
  3. Step 3: Cross multiply
    1,890.81x = 2,840.31 × 1,275.71
  4. Step 4: Simplify right side
    1,890.81x = 3,623,397.67
  5. Step 5: Solve for x
    x = 3,623,397.67/1,890.81
  6. Step 6: Final answer
    x = 1,916.32

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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.