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Finding the Fourth Proportional to 656,915.45, 906,544.65 and 355,109.45

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Solution

The fourth proportional to 656,915.45, 906,544.65 and 355,109.45 is: 490,051.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    656,915.45 : 906,544.65 = 355,109.45 : x
  2. Step 2: Convert to fraction form
    656,915.45/906,544.65 = 355,109.45/x
  3. Step 3: Cross multiply
    656,915.45x = 906,544.65 × 355,109.45
  4. Step 4: Simplify right side
    656,915.45x = 321,922,572,061.94
  5. Step 5: Solve for x
    x = 321,922,572,061.94/656,915.45
  6. Step 6: Final answer
    x = 490,051.76

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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.