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Finding the Fourth Proportional to 652.50, 900.45 and 390.51

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Solution

The fourth proportional to 652.50, 900.45 and 390.51 is: 538.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    652.50 : 900.45 = 390.51 : x
  2. Step 2: Convert to fraction form
    652.50/900.45 = 390.51/x
  3. Step 3: Cross multiply
    652.50x = 900.45 × 390.51
  4. Step 4: Simplify right side
    652.50x = 351,634.73
  5. Step 5: Solve for x
    x = 351,634.73/652.50
  6. Step 6: Final answer
    x = 538.90

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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.