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Finding the Fourth Proportional to 638,780.90, 958,171.75 and 358,494.98

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Solution

The fourth proportional to 638,780.90, 958,171.75 and 358,494.98 is: 537,742.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,780.90 : 958,171.75 = 358,494.98 : x
  2. Step 2: Convert to fraction form
    638,780.90/958,171.75 = 358,494.98/x
  3. Step 3: Cross multiply
    638,780.90x = 958,171.75 × 358,494.98
  4. Step 4: Simplify right side
    638,780.90x = 343,499,756,665.72
  5. Step 5: Solve for x
    x = 343,499,756,665.72/638,780.90
  6. Step 6: Final answer
    x = 537,742.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.