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Finding the Fourth Proportional to 775.79, 1,068.25 and 670.69

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Solution

The fourth proportional to 775.79, 1,068.25 and 670.69 is: 923.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.79 : 1,068.25 = 670.69 : x
  2. Step 2: Convert to fraction form
    775.79/1,068.25 = 670.69/x
  3. Step 3: Cross multiply
    775.79x = 1,068.25 × 670.69
  4. Step 4: Simplify right side
    775.79x = 716,464.59
  5. Step 5: Solve for x
    x = 716,464.59/775.79
  6. Step 6: Final answer
    x = 923.53

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1.5x scale

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.