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Finding the Fourth Proportional to 776.13, 1,070.73 and 657.60

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Solution

The fourth proportional to 776.13, 1,070.73 and 657.60 is: 907.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.13 : 1,070.73 = 657.60 : x
  2. Step 2: Convert to fraction form
    776.13/1,070.73 = 657.60/x
  3. Step 3: Cross multiply
    776.13x = 1,070.73 × 657.60
  4. Step 4: Simplify right side
    776.13x = 704,112.05
  5. Step 5: Solve for x
    x = 704,112.05/776.13
  6. Step 6: Final answer
    x = 907.21

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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.