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Finding the Fourth Proportional to 1,315.50, 1,970.02 and 851.88

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Solution

The fourth proportional to 1,315.50, 1,970.02 and 851.88 is: 1,275.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.50 : 1,970.02 = 851.88 : x
  2. Step 2: Convert to fraction form
    1,315.50/1,970.02 = 851.88/x
  3. Step 3: Cross multiply
    1,315.50x = 1,970.02 × 851.88
  4. Step 4: Simplify right side
    1,315.50x = 1,678,220.64
  5. Step 5: Solve for x
    x = 1,678,220.64/1,315.50
  6. Step 6: Final answer
    x = 1,275.73

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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.