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Finding the Fourth Proportional to 1,653.36, 2,478.69 and 612.69

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Solution

The fourth proportional to 1,653.36, 2,478.69 and 612.69 is: 918.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,653.36 : 2,478.69 = 612.69 : x
  2. Step 2: Convert to fraction form
    1,653.36/2,478.69 = 612.69/x
  3. Step 3: Cross multiply
    1,653.36x = 2,478.69 × 612.69
  4. Step 4: Simplify right side
    1,653.36x = 1,518,668.58
  5. Step 5: Solve for x
    x = 1,518,668.58/1,653.36
  6. Step 6: Final answer
    x = 918.53

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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.