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Finding the Fourth Proportional to 437.79, 603.96 and 313.40

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Solution

The fourth proportional to 437.79, 603.96 and 313.40 is: 432.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    437.79 : 603.96 = 313.40 : x
  2. Step 2: Convert to fraction form
    437.79/603.96 = 313.40/x
  3. Step 3: Cross multiply
    437.79x = 603.96 × 313.40
  4. Step 4: Simplify right side
    437.79x = 189,281.40
  5. Step 5: Solve for x
    x = 189,281.40/437.79
  6. Step 6: Final answer
    x = 432.36

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.