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Finding the Fourth Proportional to 289,126.20, 433,689.30 and 78,763.80

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Solution

The fourth proportional to 289,126.20, 433,689.30 and 78,763.80 is: 118,145.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,126.20 : 433,689.30 = 78,763.80 : x
  2. Step 2: Convert to fraction form
    289,126.20/433,689.30 = 78,763.80/x
  3. Step 3: Cross multiply
    289,126.20x = 433,689.30 × 78,763.80
  4. Step 4: Simplify right side
    289,126.20x = 34,159,017,287.34
  5. Step 5: Solve for x
    x = 34,159,017,287.34/289,126.20
  6. Step 6: Final answer
    x = 118,145.70

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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.