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Finding the Fourth Proportional to 1,920.45, 2,880.68 and 533.79

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Solution

The fourth proportional to 1,920.45, 2,880.68 and 533.79 is: 800.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,920.45 : 2,880.68 = 533.79 : x
  2. Step 2: Convert to fraction form
    1,920.45/2,880.68 = 533.79/x
  3. Step 3: Cross multiply
    1,920.45x = 2,880.68 × 533.79
  4. Step 4: Simplify right side
    1,920.45x = 1,537,678.18
  5. Step 5: Solve for x
    x = 1,537,678.18/1,920.45
  6. Step 6: Final answer
    x = 800.69

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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.