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Finding the Fourth Proportional to 652.72, 900.60 and 390.74

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Solution

The fourth proportional to 652.72, 900.60 and 390.74 is: 539.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    652.72 : 900.60 = 390.74 : x
  2. Step 2: Convert to fraction form
    652.72/900.60 = 390.74/x
  3. Step 3: Cross multiply
    652.72x = 900.60 × 390.74
  4. Step 4: Simplify right side
    652.72x = 351,900.44
  5. Step 5: Solve for x
    x = 351,900.44/652.72
  6. Step 6: Final answer
    x = 539.13

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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.