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Finding the Fourth Proportional to 715,793.30, 987,736.04 and 421,396.29

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Solution

The fourth proportional to 715,793.30, 987,736.04 and 421,396.29 is: 581,492.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,793.30 : 987,736.04 = 421,396.29 : x
  2. Step 2: Convert to fraction form
    715,793.30/987,736.04 = 421,396.29/x
  3. Step 3: Cross multiply
    715,793.30x = 987,736.04 × 421,396.29
  4. Step 4: Simplify right side
    715,793.30x = 416,228,302,228.55
  5. Step 5: Solve for x
    x = 416,228,302,228.55/715,793.30
  6. Step 6: Final answer
    x = 581,492.31

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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.