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Finding the Fourth Proportional to 474.98, 655.70 and 317.70

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Solution

The fourth proportional to 474.98, 655.70 and 317.70 is: 438.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    474.98 : 655.70 = 317.70 : x
  2. Step 2: Convert to fraction form
    474.98/655.70 = 317.70/x
  3. Step 3: Cross multiply
    474.98x = 655.70 × 317.70
  4. Step 4: Simplify right side
    474.98x = 208,315.89
  5. Step 5: Solve for x
    x = 208,315.89/474.98
  6. Step 6: Final answer
    x = 438.58

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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.