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Finding the Fourth Proportional to 1,585.36, 2,378.72 and 612.15

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Solution

The fourth proportional to 1,585.36, 2,378.72 and 612.15 is: 918.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,585.36 : 2,378.72 = 612.15 : x
  2. Step 2: Convert to fraction form
    1,585.36/2,378.72 = 612.15/x
  3. Step 3: Cross multiply
    1,585.36x = 2,378.72 × 612.15
  4. Step 4: Simplify right side
    1,585.36x = 1,456,126.06
  5. Step 5: Solve for x
    x = 1,456,126.06/1,585.36
  6. Step 6: Final answer
    x = 918.48

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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.