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Finding the Fourth Proportional to 978,835.42, 1,351,372 and 616,569.80

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Solution

The fourth proportional to 978,835.42, 1,351,372 and 616,569.80 is: 851,231.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,835.42 : 1,351,372 = 616,569.80 : x
  2. Step 2: Convert to fraction form
    978,835.42/1,351,372 = 616,569.80/x
  3. Step 3: Cross multiply
    978,835.42x = 1,351,372 × 616,569.80
  4. Step 4: Simplify right side
    978,835.42x = 833,215,163,765.60
  5. Step 5: Solve for x
    x = 833,215,163,765.60/978,835.42
  6. Step 6: Final answer
    x = 851,231.11

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.