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Finding the Fourth Proportional to 744.64, 1,025.28 and 708.16

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Solution

The fourth proportional to 744.64, 1,025.28 and 708.16 is: 975.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.64 : 1,025.28 = 708.16 : x
  2. Step 2: Convert to fraction form
    744.64/1,025.28 = 708.16/x
  3. Step 3: Cross multiply
    744.64x = 1,025.28 × 708.16
  4. Step 4: Simplify right side
    744.64x = 726,062.28
  5. Step 5: Solve for x
    x = 726,062.28/744.64
  6. Step 6: Final answer
    x = 975.05

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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.