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Finding the Fourth Proportional to 1,275.77, 1,760.48 and 708.64

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Solution

The fourth proportional to 1,275.77, 1,760.48 and 708.64 is: 977.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.77 : 1,760.48 = 708.64 : x
  2. Step 2: Convert to fraction form
    1,275.77/1,760.48 = 708.64/x
  3. Step 3: Cross multiply
    1,275.77x = 1,760.48 × 708.64
  4. Step 4: Simplify right side
    1,275.77x = 1,247,541.26
  5. Step 5: Solve for x
    x = 1,247,541.26/1,275.77
  6. Step 6: Final answer
    x = 977.87

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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.