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Finding the Fourth Proportional to 909.99, 1,364.80 and 354.70

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Solution

The fourth proportional to 909.99, 1,364.80 and 354.70 is: 531.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.99 : 1,364.80 = 354.70 : x
  2. Step 2: Convert to fraction form
    909.99/1,364.80 = 354.70/x
  3. Step 3: Cross multiply
    909.99x = 1,364.80 × 354.70
  4. Step 4: Simplify right side
    909.99x = 484,094.56
  5. Step 5: Solve for x
    x = 484,094.56/909.99
  6. Step 6: Final answer
    x = 531.98

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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.