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Finding the Fourth Proportional to 715,915.14, 987,904.04 and 421,518.06

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Solution

The fourth proportional to 715,915.14, 987,904.04 and 421,518.06 is: 581,660.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,915.14 : 987,904.04 = 421,518.06 : x
  2. Step 2: Convert to fraction form
    715,915.14/987,904.04 = 421,518.06/x
  3. Step 3: Cross multiply
    715,915.14x = 987,904.04 × 421,518.06
  4. Step 4: Simplify right side
    715,915.14x = 416,419,392,299.37
  5. Step 5: Solve for x
    x = 416,419,392,299.37/715,915.14
  6. Step 6: Final answer
    x = 581,660.27

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1.5x scale

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.