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Finding the Fourth Proportional to 659.79, 910.40 and 379.98

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Solution

The fourth proportional to 659.79, 910.40 and 379.98 is: 524.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.79 : 910.40 = 379.98 : x
  2. Step 2: Convert to fraction form
    659.79/910.40 = 379.98/x
  3. Step 3: Cross multiply
    659.79x = 910.40 × 379.98
  4. Step 4: Simplify right side
    659.79x = 345,931.89
  5. Step 5: Solve for x
    x = 345,931.89/659.79
  6. Step 6: Final answer
    x = 524.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.