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Finding the Fourth Proportional to 1,313.92, 1,970.88 and 340.12

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Solution

The fourth proportional to 1,313.92, 1,970.88 and 340.12 is: 510.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.92 : 1,970.88 = 340.12 : x
  2. Step 2: Convert to fraction form
    1,313.92/1,970.88 = 340.12/x
  3. Step 3: Cross multiply
    1,313.92x = 1,970.88 × 340.12
  4. Step 4: Simplify right side
    1,313.92x = 670,335.71
  5. Step 5: Solve for x
    x = 670,335.71/1,313.92
  6. Step 6: Final answer
    x = 510.18

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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.