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Finding the Fourth Proportional to 423,279.18, 634,879.89 and 142,798.86

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Solution

The fourth proportional to 423,279.18, 634,879.89 and 142,798.86 is: 214,185.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    423,279.18 : 634,879.89 = 142,798.86 : x
  2. Step 2: Convert to fraction form
    423,279.18/634,879.89 = 142,798.86/x
  3. Step 3: Cross multiply
    423,279.18x = 634,879.89 × 142,798.86
  4. Step 4: Simplify right side
    423,279.18x = 90,660,124,528.93
  5. Step 5: Solve for x
    x = 90,660,124,528.93/423,279.18
  6. Step 6: Final answer
    x = 214,185.17

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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.