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Finding the Fourth Proportional to 1,946.43, 2,919.45 and 647.76

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Solution

The fourth proportional to 1,946.43, 2,919.45 and 647.76 is: 971.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,946.43 : 2,919.45 = 647.76 : x
  2. Step 2: Convert to fraction form
    1,946.43/2,919.45 = 647.76/x
  3. Step 3: Cross multiply
    1,946.43x = 2,919.45 × 647.76
  4. Step 4: Simplify right side
    1,946.43x = 1,891,102.93
  5. Step 5: Solve for x
    x = 1,891,102.93/1,946.43
  6. Step 6: Final answer
    x = 971.58

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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.