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Finding the Fourth Proportional to 776.45, 1,164.55 and 645.51

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Solution

The fourth proportional to 776.45, 1,164.55 and 645.51 is: 968.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.45 : 1,164.55 = 645.51 : x
  2. Step 2: Convert to fraction form
    776.45/1,164.55 = 645.51/x
  3. Step 3: Cross multiply
    776.45x = 1,164.55 × 645.51
  4. Step 4: Simplify right side
    776.45x = 751,728.67
  5. Step 5: Solve for x
    x = 751,728.67/776.45
  6. Step 6: Final answer
    x = 968.16

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1.5x scale

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.