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Finding the Fourth Proportional to 1,275.40, 1,913.28 and 650.92

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Solution

The fourth proportional to 1,275.40, 1,913.28 and 650.92 is: 976.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.40 : 1,913.28 = 650.92 : x
  2. Step 2: Convert to fraction form
    1,275.40/1,913.28 = 650.92/x
  3. Step 3: Cross multiply
    1,275.40x = 1,913.28 × 650.92
  4. Step 4: Simplify right side
    1,275.40x = 1,245,392.22
  5. Step 5: Solve for x
    x = 1,245,392.22/1,275.40
  6. Step 6: Final answer
    x = 976.47

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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.