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Finding the Fourth Proportional to 659.98, 988.86 and 415.96

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Solution

The fourth proportional to 659.98, 988.86 and 415.96 is: 623.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.98 : 988.86 = 415.96 : x
  2. Step 2: Convert to fraction form
    659.98/988.86 = 415.96/x
  3. Step 3: Cross multiply
    659.98x = 988.86 × 415.96
  4. Step 4: Simplify right side
    659.98x = 411,326.21
  5. Step 5: Solve for x
    x = 411,326.21/659.98
  6. Step 6: Final answer
    x = 623.24

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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.