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Finding the Fourth Proportional to 1,615.80, 2,424.72 and 641.76

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Solution

The fourth proportional to 1,615.80, 2,424.72 and 641.76 is: 963.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,615.80 : 2,424.72 = 641.76 : x
  2. Step 2: Convert to fraction form
    1,615.80/2,424.72 = 641.76/x
  3. Step 3: Cross multiply
    1,615.80x = 2,424.72 × 641.76
  4. Step 4: Simplify right side
    1,615.80x = 1,556,088.31
  5. Step 5: Solve for x
    x = 1,556,088.31/1,615.80
  6. Step 6: Final answer
    x = 963.05

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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.