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Finding the Fourth Proportional to 1,946.79, 2,919.23 and 647.82

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Solution

The fourth proportional to 1,946.79, 2,919.23 and 647.82 is: 971.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,946.79 : 2,919.23 = 647.82 : x
  2. Step 2: Convert to fraction form
    1,946.79/2,919.23 = 647.82/x
  3. Step 3: Cross multiply
    1,946.79x = 2,919.23 × 647.82
  4. Step 4: Simplify right side
    1,946.79x = 1,891,132.34
  5. Step 5: Solve for x
    x = 1,891,132.34/1,946.79
  6. Step 6: Final answer
    x = 971.41

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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.