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Finding the Fourth Proportional to 1,875.29, 2,812.61 and 689.07

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Solution

The fourth proportional to 1,875.29, 2,812.61 and 689.07 is: 1,033.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,875.29 : 2,812.61 = 689.07 : x
  2. Step 2: Convert to fraction form
    1,875.29/2,812.61 = 689.07/x
  3. Step 3: Cross multiply
    1,875.29x = 2,812.61 × 689.07
  4. Step 4: Simplify right side
    1,875.29x = 1,938,069.84
  5. Step 5: Solve for x
    x = 1,938,069.84/1,875.29
  6. Step 6: Final answer
    x = 1,033.48

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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.