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Finding the Fourth Proportional to 1,728.20, 2,592.30 and 429.67

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Solution

The fourth proportional to 1,728.20, 2,592.30 and 429.67 is: 644.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,728.20 : 2,592.30 = 429.67 : x
  2. Step 2: Convert to fraction form
    1,728.20/2,592.30 = 429.67/x
  3. Step 3: Cross multiply
    1,728.20x = 2,592.30 × 429.67
  4. Step 4: Simplify right side
    1,728.20x = 1,113,820.58
  5. Step 5: Solve for x
    x = 1,113,820.58/1,728.20
  6. Step 6: Final answer
    x = 644.50

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1.5x scale

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.