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Finding the Fourth Proportional to 652.25, 899.91 and 390.21

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Solution

The fourth proportional to 652.25, 899.91 and 390.21 is: 538.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    652.25 : 899.91 = 390.21 : x
  2. Step 2: Convert to fraction form
    652.25/899.91 = 390.21/x
  3. Step 3: Cross multiply
    652.25x = 899.91 × 390.21
  4. Step 4: Simplify right side
    652.25x = 351,153.88
  5. Step 5: Solve for x
    x = 351,153.88/652.25
  6. Step 6: Final answer
    x = 538.38

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1.5x scale

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.