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Finding the Fourth Proportional to 1,920.72, 2,880.80 and 993.52

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Solution

The fourth proportional to 1,920.72, 2,880.80 and 993.52 is: 1,490.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,920.72 : 2,880.80 = 993.52 : x
  2. Step 2: Convert to fraction form
    1,920.72/2,880.80 = 993.52/x
  3. Step 3: Cross multiply
    1,920.72x = 2,880.80 × 993.52
  4. Step 4: Simplify right side
    1,920.72x = 2,862,132.42
  5. Step 5: Solve for x
    x = 2,862,132.42/1,920.72
  6. Step 6: Final answer
    x = 1,490.14

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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.