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Finding the Fourth Proportional to 612,436.36, 918,450.14 and 257,384.20

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Solution

The fourth proportional to 612,436.36, 918,450.14 and 257,384.20 is: 385,990.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,436.36 : 918,450.14 = 257,384.20 : x
  2. Step 2: Convert to fraction form
    612,436.36/918,450.14 = 257,384.20/x
  3. Step 3: Cross multiply
    612,436.36x = 918,450.14 × 257,384.20
  4. Step 4: Simplify right side
    612,436.36x = 236,394,554,523.79
  5. Step 5: Solve for x
    x = 236,394,554,523.79/612,436.36
  6. Step 6: Final answer
    x = 385,990.40

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.