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Finding the Fourth Proportional to 612,078.30, 918,117.45 and 280,302.30

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Solution

The fourth proportional to 612,078.30, 918,117.45 and 280,302.30 is: 420,453.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,078.30 : 918,117.45 = 280,302.30 : x
  2. Step 2: Convert to fraction form
    612,078.30/918,117.45 = 280,302.30/x
  3. Step 3: Cross multiply
    612,078.30x = 918,117.45 × 280,302.30
  4. Step 4: Simplify right side
    612,078.30x = 257,350,432,905.14
  5. Step 5: Solve for x
    x = 257,350,432,905.14/612,078.30
  6. Step 6: Final answer
    x = 420,453.45

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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.