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Finding the Fourth Proportional to 1,275.12, 1,759.43 and 715.51

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Solution

The fourth proportional to 1,275.12, 1,759.43 and 715.51 is: 987.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.12 : 1,759.43 = 715.51 : x
  2. Step 2: Convert to fraction form
    1,275.12/1,759.43 = 715.51/x
  3. Step 3: Cross multiply
    1,275.12x = 1,759.43 × 715.51
  4. Step 4: Simplify right side
    1,275.12x = 1,258,893.75
  5. Step 5: Solve for x
    x = 1,258,893.75/1,275.12
  6. Step 6: Final answer
    x = 987.27

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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.