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Finding the Fourth Proportional to 788.51, 1,090.50 and 690.10

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Solution

The fourth proportional to 788.51, 1,090.50 and 690.10 is: 954.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.51 : 1,090.50 = 690.10 : x
  2. Step 2: Convert to fraction form
    788.51/1,090.50 = 690.10/x
  3. Step 3: Cross multiply
    788.51x = 1,090.50 × 690.10
  4. Step 4: Simplify right side
    788.51x = 752,554.05
  5. Step 5: Solve for x
    x = 752,554.05/788.51
  6. Step 6: Final answer
    x = 954.40

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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.