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Finding the Fourth Proportional to 874.57, 1,312.02 and 289.60

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Solution

The fourth proportional to 874.57, 1,312.02 and 289.60 is: 434.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.57 : 1,312.02 = 289.60 : x
  2. Step 2: Convert to fraction form
    874.57/1,312.02 = 289.60/x
  3. Step 3: Cross multiply
    874.57x = 1,312.02 × 289.60
  4. Step 4: Simplify right side
    874.57x = 379,960.99
  5. Step 5: Solve for x
    x = 379,960.99/874.57
  6. Step 6: Final answer
    x = 434.45

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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.