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Finding the Fourth Proportional to 1,275.65, 1,913.07 and 867.41

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Solution

The fourth proportional to 1,275.65, 1,913.07 and 867.41 is: 1,300.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.65 : 1,913.07 = 867.41 : x
  2. Step 2: Convert to fraction form
    1,275.65/1,913.07 = 867.41/x
  3. Step 3: Cross multiply
    1,275.65x = 1,913.07 × 867.41
  4. Step 4: Simplify right side
    1,275.65x = 1,659,411.71
  5. Step 5: Solve for x
    x = 1,659,411.71/1,275.65
  6. Step 6: Final answer
    x = 1,300.84

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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.