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Finding the Fourth Proportional to 1,585.00, 2,187.21 and 921.74

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Solution

The fourth proportional to 1,585.00, 2,187.21 and 921.74 is: 1,271.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,585.00 : 2,187.21 = 921.74 : x
  2. Step 2: Convert to fraction form
    1,585.00/2,187.21 = 921.74/x
  3. Step 3: Cross multiply
    1,585.00x = 2,187.21 × 921.74
  4. Step 4: Simplify right side
    1,585.00x = 2,016,038.95
  5. Step 5: Solve for x
    x = 2,016,038.95/1,585.00
  6. Step 6: Final answer
    x = 1,271.95

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.