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Finding the Fourth Proportional to 1,438.91, 2,158.61 and 515.00

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Solution

The fourth proportional to 1,438.91, 2,158.61 and 515.00 is: 772.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.91 : 2,158.61 = 515.00 : x
  2. Step 2: Convert to fraction form
    1,438.91/2,158.61 = 515.00/x
  3. Step 3: Cross multiply
    1,438.91x = 2,158.61 × 515.00
  4. Step 4: Simplify right side
    1,438.91x = 1,111,690.83
  5. Step 5: Solve for x
    x = 1,111,690.83/1,438.91
  6. Step 6: Final answer
    x = 772.60

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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.