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Finding the Fourth Proportional to 661,638.80, 992,717.40 and 262,211.60

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Solution

The fourth proportional to 661,638.80, 992,717.40 and 262,211.60 is: 393,420.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,638.80 : 992,717.40 = 262,211.60 : x
  2. Step 2: Convert to fraction form
    661,638.80/992,717.40 = 262,211.60/x
  3. Step 3: Cross multiply
    661,638.80x = 992,717.40 × 262,211.60
  4. Step 4: Simplify right side
    661,638.80x = 260,302,017,801.84
  5. Step 5: Solve for x
    x = 260,302,017,801.84/661,638.80
  6. Step 6: Final answer
    x = 393,420.12

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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.