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Finding the Fourth Proportional to 2,919.85, 4,379.10 and 971.53

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Solution

The fourth proportional to 2,919.85, 4,379.10 and 971.53 is: 1,457.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,919.85 : 4,379.10 = 971.53 : x
  2. Step 2: Convert to fraction form
    2,919.85/4,379.10 = 971.53/x
  3. Step 3: Cross multiply
    2,919.85x = 4,379.10 × 971.53
  4. Step 4: Simplify right side
    2,919.85x = 4,254,427.02
  5. Step 5: Solve for x
    x = 4,254,427.02/2,919.85
  6. Step 6: Final answer
    x = 1,457.07

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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.