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Finding the Fourth Proportional to 612,109.20, 918,163.80 and 472,141.20

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Solution

The fourth proportional to 612,109.20, 918,163.80 and 472,141.20 is: 708,211.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,109.20 : 918,163.80 = 472,141.20 : x
  2. Step 2: Convert to fraction form
    612,109.20/918,163.80 = 472,141.20/x
  3. Step 3: Cross multiply
    612,109.20x = 918,163.80 × 472,141.20
  4. Step 4: Simplify right side
    612,109.20x = 433,502,958,328.56
  5. Step 5: Solve for x
    x = 433,502,958,328.56/612,109.20
  6. Step 6: Final answer
    x = 708,211.80

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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.