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Finding the Fourth Proportional to 1,309.40, 1,964.37 and 651.63

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Solution

The fourth proportional to 1,309.40, 1,964.37 and 651.63 is: 977.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.40 : 1,964.37 = 651.63 : x
  2. Step 2: Convert to fraction form
    1,309.40/1,964.37 = 651.63/x
  3. Step 3: Cross multiply
    1,309.40x = 1,964.37 × 651.63
  4. Step 4: Simplify right side
    1,309.40x = 1,280,042.42
  5. Step 5: Solve for x
    x = 1,280,042.42/1,309.40
  6. Step 6: Final answer
    x = 977.58

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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.