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Finding the Fourth Proportional to 1,280.76, 1,768.46 and 1,031.28

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Solution

The fourth proportional to 1,280.76, 1,768.46 and 1,031.28 is: 1,423.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.76 : 1,768.46 = 1,031.28 : x
  2. Step 2: Convert to fraction form
    1,280.76/1,768.46 = 1,031.28/x
  3. Step 3: Cross multiply
    1,280.76x = 1,768.46 × 1,031.28
  4. Step 4: Simplify right side
    1,280.76x = 1,823,777.43
  5. Step 5: Solve for x
    x = 1,823,777.43/1,280.76
  6. Step 6: Final answer
    x = 1,423.98

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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.