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Finding the Fourth Proportional to 1,615.29, 2,421.94 and 690.33

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Solution

The fourth proportional to 1,615.29, 2,421.94 and 690.33 is: 1,035.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,615.29 : 2,421.94 = 690.33 : x
  2. Step 2: Convert to fraction form
    1,615.29/2,421.94 = 690.33/x
  3. Step 3: Cross multiply
    1,615.29x = 2,421.94 × 690.33
  4. Step 4: Simplify right side
    1,615.29x = 1,671,937.84
  5. Step 5: Solve for x
    x = 1,671,937.84/1,615.29
  6. Step 6: Final answer
    x = 1,035.07

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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.