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Finding the Fourth Proportional to 661,678.60, 992,031.90 and 262,121.80

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Solution

The fourth proportional to 661,678.60, 992,031.90 and 262,121.80 is: 392,990.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,678.60 : 992,031.90 = 262,121.80 : x
  2. Step 2: Convert to fraction form
    661,678.60/992,031.90 = 262,121.80/x
  3. Step 3: Cross multiply
    661,678.60x = 992,031.90 × 262,121.80
  4. Step 4: Simplify right side
    661,678.60x = 260,033,187,285.42
  5. Step 5: Solve for x
    x = 260,033,187,285.42/661,678.60
  6. Step 6: Final answer
    x = 392,990.17

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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.