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Finding the Fourth Proportional to 661,367.42, 987,559.34 and 643,431.32

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Solution

The fourth proportional to 661,367.42, 987,559.34 and 643,431.32 is: 960,777.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,367.42 : 987,559.34 = 643,431.32 : x
  2. Step 2: Convert to fraction form
    661,367.42/987,559.34 = 643,431.32/x
  3. Step 3: Cross multiply
    661,367.42x = 987,559.34 × 643,431.32
  4. Step 4: Simplify right side
    661,367.42x = 635,426,609,714.53
  5. Step 5: Solve for x
    x = 635,426,609,714.53/661,367.42
  6. Step 6: Final answer
    x = 960,777.01

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.