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Finding the Fourth Proportional to 971.80, 1,457.74 and 394.60

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Solution

The fourth proportional to 971.80, 1,457.74 and 394.60 is: 591.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.80 : 1,457.74 = 394.60 : x
  2. Step 2: Convert to fraction form
    971.80/1,457.74 = 394.60/x
  3. Step 3: Cross multiply
    971.80x = 1,457.74 × 394.60
  4. Step 4: Simplify right side
    971.80x = 575,224.20
  5. Step 5: Solve for x
    x = 575,224.20/971.80
  6. Step 6: Final answer
    x = 591.92

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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.