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Finding the Fourth Proportional to 1,153.51, 1,591.24 and 780.62

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Solution

The fourth proportional to 1,153.51, 1,591.24 and 780.62 is: 1,076.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,153.51 : 1,591.24 = 780.62 : x
  2. Step 2: Convert to fraction form
    1,153.51/1,591.24 = 780.62/x
  3. Step 3: Cross multiply
    1,153.51x = 1,591.24 × 780.62
  4. Step 4: Simplify right side
    1,153.51x = 1,242,153.77
  5. Step 5: Solve for x
    x = 1,242,153.77/1,153.51
  6. Step 6: Final answer
    x = 1,076.85

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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.