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Finding the Fourth Proportional to 1,653.19, 2,480.75 and 613.93

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Solution

The fourth proportional to 1,653.19, 2,480.75 and 613.93 is: 921.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,653.19 : 2,480.75 = 613.93 : x
  2. Step 2: Convert to fraction form
    1,653.19/2,480.75 = 613.93/x
  3. Step 3: Cross multiply
    1,653.19x = 2,480.75 × 613.93
  4. Step 4: Simplify right side
    1,653.19x = 1,523,006.85
  5. Step 5: Solve for x
    x = 1,523,006.85/1,653.19
  6. Step 6: Final answer
    x = 921.25

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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.