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Finding the Fourth Proportional to 532.47, 734.70 and 311.40

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Solution

The fourth proportional to 532.47, 734.70 and 311.40 is: 429.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    532.47 : 734.70 = 311.40 : x
  2. Step 2: Convert to fraction form
    532.47/734.70 = 311.40/x
  3. Step 3: Cross multiply
    532.47x = 734.70 × 311.40
  4. Step 4: Simplify right side
    532.47x = 228,785.58
  5. Step 5: Solve for x
    x = 228,785.58/532.47
  6. Step 6: Final answer
    x = 429.67

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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.