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Finding the Fourth Proportional to 1,507.60, 2,261.40 and 777.39

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Solution

The fourth proportional to 1,507.60, 2,261.40 and 777.39 is: 1,166.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,507.60 : 2,261.40 = 777.39 : x
  2. Step 2: Convert to fraction form
    1,507.60/2,261.40 = 777.39/x
  3. Step 3: Cross multiply
    1,507.60x = 2,261.40 × 777.39
  4. Step 4: Simplify right side
    1,507.60x = 1,757,989.75
  5. Step 5: Solve for x
    x = 1,757,989.75/1,507.60
  6. Step 6: Final answer
    x = 1,166.09

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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.