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Finding the Fourth Proportional to 898.49, 1,347.82 and 313.40

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Solution

The fourth proportional to 898.49, 1,347.82 and 313.40 is: 470.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.49 : 1,347.82 = 313.40 : x
  2. Step 2: Convert to fraction form
    898.49/1,347.82 = 313.40/x
  3. Step 3: Cross multiply
    898.49x = 1,347.82 × 313.40
  4. Step 4: Simplify right side
    898.49x = 422,411.14
  5. Step 5: Solve for x
    x = 422,411.14/898.49
  6. Step 6: Final answer
    x = 470.13

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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.