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Finding the Fourth Proportional to 1,415.40, 2,124.04 and 538.71

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Solution

The fourth proportional to 1,415.40, 2,124.04 and 538.71 is: 808.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,415.40 : 2,124.04 = 538.71 : x
  2. Step 2: Convert to fraction form
    1,415.40/2,124.04 = 538.71/x
  3. Step 3: Cross multiply
    1,415.40x = 2,124.04 × 538.71
  4. Step 4: Simplify right side
    1,415.40x = 1,144,241.59
  5. Step 5: Solve for x
    x = 1,144,241.59/1,415.40
  6. Step 6: Final answer
    x = 808.42

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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.