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Finding the Fourth Proportional to 652.59, 900.68 and 390.65

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Solution

The fourth proportional to 652.59, 900.68 and 390.65 is: 539.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    652.59 : 900.68 = 390.65 : x
  2. Step 2: Convert to fraction form
    652.59/900.68 = 390.65/x
  3. Step 3: Cross multiply
    652.59x = 900.68 × 390.65
  4. Step 4: Simplify right side
    652.59x = 351,844.19
  5. Step 5: Solve for x
    x = 351,844.19/652.59
  6. Step 6: Final answer
    x = 539.15

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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.