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Finding the Fourth Proportional to 423,419.81, 634,995.90 and 139,063.50

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Solution

The fourth proportional to 423,419.81, 634,995.90 and 139,063.50 is: 208,551.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    423,419.81 : 634,995.90 = 139,063.50 : x
  2. Step 2: Convert to fraction form
    423,419.81/634,995.90 = 139,063.50/x
  3. Step 3: Cross multiply
    423,419.81x = 634,995.90 × 139,063.50
  4. Step 4: Simplify right side
    423,419.81x = 88,304,752,339.65
  5. Step 5: Solve for x
    x = 88,304,752,339.65/423,419.81
  6. Step 6: Final answer
    x = 208,551.30

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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.