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Finding the Fourth Proportional to 652.18, 899.50 and 389.92

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Solution

The fourth proportional to 652.18, 899.50 and 389.92 is: 537.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    652.18 : 899.50 = 389.92 : x
  2. Step 2: Convert to fraction form
    652.18/899.50 = 389.92/x
  3. Step 3: Cross multiply
    652.18x = 899.50 × 389.92
  4. Step 4: Simplify right side
    652.18x = 350,733.04
  5. Step 5: Solve for x
    x = 350,733.04/652.18
  6. Step 6: Final answer
    x = 537.79

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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.