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Finding the Fourth Proportional to 1,135.10, 1,698.60 and 770.60

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Solution

The fourth proportional to 1,135.10, 1,698.60 and 770.60 is: 1,153.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,135.10 : 1,698.60 = 770.60 : x
  2. Step 2: Convert to fraction form
    1,135.10/1,698.60 = 770.60/x
  3. Step 3: Cross multiply
    1,135.10x = 1,698.60 × 770.60
  4. Step 4: Simplify right side
    1,135.10x = 1,308,941.16
  5. Step 5: Solve for x
    x = 1,308,941.16/1,135.10
  6. Step 6: Final answer
    x = 1,153.15

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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.