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Finding the Fourth Proportional to 971.95, 1,458.21 and 313.81

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Solution

The fourth proportional to 971.95, 1,458.21 and 313.81 is: 470.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.95 : 1,458.21 = 313.81 : x
  2. Step 2: Convert to fraction form
    971.95/1,458.21 = 313.81/x
  3. Step 3: Cross multiply
    971.95x = 1,458.21 × 313.81
  4. Step 4: Simplify right side
    971.95x = 457,606.03
  5. Step 5: Solve for x
    x = 457,606.03/971.95
  6. Step 6: Final answer
    x = 470.81

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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.