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Finding the Fourth Proportional to 1,946.56, 2,920 and 971.76

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Solution

The fourth proportional to 1,946.56, 2,920 and 971.76 is: 1,457.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,946.56 : 2,920 = 971.76 : x
  2. Step 2: Convert to fraction form
    1,946.56/2,920 = 971.76/x
  3. Step 3: Cross multiply
    1,946.56x = 2,920 × 971.76
  4. Step 4: Simplify right side
    1,946.56x = 2,837,539.20
  5. Step 5: Solve for x
    x = 2,837,539.20/1,946.56
  6. Step 6: Final answer
    x = 1,457.72

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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.