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Finding the Fourth Proportional to 652.08, 899.92 and 390.24

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Solution

The fourth proportional to 652.08, 899.92 and 390.24 is: 538.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    652.08 : 899.92 = 390.24 : x
  2. Step 2: Convert to fraction form
    652.08/899.92 = 390.24/x
  3. Step 3: Cross multiply
    652.08x = 899.92 × 390.24
  4. Step 4: Simplify right side
    652.08x = 351,184.78
  5. Step 5: Solve for x
    x = 351,184.78/652.08
  6. Step 6: Final answer
    x = 538.56

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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.