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Finding the Fourth Proportional to 1,585.54, 2,378.61 and 611.72

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Solution

The fourth proportional to 1,585.54, 2,378.61 and 611.72 is: 917.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,585.54 : 2,378.61 = 611.72 : x
  2. Step 2: Convert to fraction form
    1,585.54/2,378.61 = 611.72/x
  3. Step 3: Cross multiply
    1,585.54x = 2,378.61 × 611.72
  4. Step 4: Simplify right side
    1,585.54x = 1,455,043.31
  5. Step 5: Solve for x
    x = 1,455,043.31/1,585.54
  6. Step 6: Final answer
    x = 917.70

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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.