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Finding the Fourth Proportional to 913.06, 1,259.08 and 689.51

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Solution

The fourth proportional to 913.06, 1,259.08 and 689.51 is: 950.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.06 : 1,259.08 = 689.51 : x
  2. Step 2: Convert to fraction form
    913.06/1,259.08 = 689.51/x
  3. Step 3: Cross multiply
    913.06x = 1,259.08 × 689.51
  4. Step 4: Simplify right side
    913.06x = 868,149.67
  5. Step 5: Solve for x
    x = 868,149.67/913.06
  6. Step 6: Final answer
    x = 950.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.