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Finding the Fourth Proportional to 1,615.98, 2,425.80 and 642.77

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Solution

The fourth proportional to 1,615.98, 2,425.80 and 642.77 is: 964.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,615.98 : 2,425.80 = 642.77 : x
  2. Step 2: Convert to fraction form
    1,615.98/2,425.80 = 642.77/x
  3. Step 3: Cross multiply
    1,615.98x = 2,425.80 × 642.77
  4. Step 4: Simplify right side
    1,615.98x = 1,559,219.34
  5. Step 5: Solve for x
    x = 1,559,219.34/1,615.98
  6. Step 6: Final answer
    x = 964.88

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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.