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Finding the Fourth Proportional to 661,639.80, 992,718.90 and 262,212.60

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Solution

The fourth proportional to 661,639.80, 992,718.90 and 262,212.60 is: 393,421.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,639.80 : 992,718.90 = 262,212.60 : x
  2. Step 2: Convert to fraction form
    661,639.80/992,718.90 = 262,212.60/x
  3. Step 3: Cross multiply
    661,639.80x = 992,718.90 × 262,212.60
  4. Step 4: Simplify right side
    661,639.80x = 260,303,403,838.14
  5. Step 5: Solve for x
    x = 260,303,403,838.14/661,639.80
  6. Step 6: Final answer
    x = 393,421.62

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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.