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Finding the Fourth Proportional to 659.17, 988.77 and 312.42

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Solution

The fourth proportional to 659.17, 988.77 and 312.42 is: 468.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.17 : 988.77 = 312.42 : x
  2. Step 2: Convert to fraction form
    659.17/988.77 = 312.42/x
  3. Step 3: Cross multiply
    659.17x = 988.77 × 312.42
  4. Step 4: Simplify right side
    659.17x = 308,911.52
  5. Step 5: Solve for x
    x = 308,911.52/659.17
  6. Step 6: Final answer
    x = 468.64

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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.