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Finding the Fourth Proportional to 620.57, 931.14 and 312.45

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Solution

The fourth proportional to 620.57, 931.14 and 312.45 is: 468.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.57 : 931.14 = 312.45 : x
  2. Step 2: Convert to fraction form
    620.57/931.14 = 312.45/x
  3. Step 3: Cross multiply
    620.57x = 931.14 × 312.45
  4. Step 4: Simplify right side
    620.57x = 290,934.69
  5. Step 5: Solve for x
    x = 290,934.69/620.57
  6. Step 6: Final answer
    x = 468.82

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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.