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Finding the Fourth Proportional to 612,096.90, 918,145.35 and 257,511.30

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Solution

The fourth proportional to 612,096.90, 918,145.35 and 257,511.30 is: 386,266.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,096.90 : 918,145.35 = 257,511.30 : x
  2. Step 2: Convert to fraction form
    612,096.90/918,145.35 = 257,511.30/x
  3. Step 3: Cross multiply
    612,096.90x = 918,145.35 × 257,511.30
  4. Step 4: Simplify right side
    612,096.90x = 236,432,802,667.46
  5. Step 5: Solve for x
    x = 236,432,802,667.46/612,096.90
  6. Step 6: Final answer
    x = 386,266.95

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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.