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Finding the Fourth Proportional to 607.70, 909.90 and 318.56

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Solution

The fourth proportional to 607.70, 909.90 and 318.56 is: 476.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    607.70 : 909.90 = 318.56 : x
  2. Step 2: Convert to fraction form
    607.70/909.90 = 318.56/x
  3. Step 3: Cross multiply
    607.70x = 909.90 × 318.56
  4. Step 4: Simplify right side
    607.70x = 289,857.74
  5. Step 5: Solve for x
    x = 289,857.74/607.70
  6. Step 6: Final answer
    x = 476.98

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.