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Finding the Fourth Proportional to 917,636.80, 1,375,288.80 and 443,300.80

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Solution

The fourth proportional to 917,636.80, 1,375,288.80 and 443,300.80 is: 664,387.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    917,636.80 : 1,375,288.80 = 443,300.80 : x
  2. Step 2: Convert to fraction form
    917,636.80/1,375,288.80 = 443,300.80/x
  3. Step 3: Cross multiply
    917,636.80x = 1,375,288.80 × 443,300.80
  4. Step 4: Simplify right side
    917,636.80x = 609,666,625,271.04
  5. Step 5: Solve for x
    x = 609,666,625,271.04/917,636.80
  6. Step 6: Final answer
    x = 664,387.72

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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.