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Finding the Fourth Proportional to 426,491.42, 639,036.93 and 145,855.58

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Solution

The fourth proportional to 426,491.42, 639,036.93 and 145,855.58 is: 218,543.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,491.42 : 639,036.93 = 145,855.58 : x
  2. Step 2: Convert to fraction form
    426,491.42/639,036.93 = 145,855.58/x
  3. Step 3: Cross multiply
    426,491.42x = 639,036.93 × 145,855.58
  4. Step 4: Simplify right side
    426,491.42x = 93,207,102,066.57
  5. Step 5: Solve for x
    x = 93,207,102,066.57/426,491.42
  6. Step 6: Final answer
    x = 218,543.91

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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.