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Finding the Fourth Proportional to 612,316.20, 918,474.30 and 312,697.20

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Solution

The fourth proportional to 612,316.20, 918,474.30 and 312,697.20 is: 469,045.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,316.20 : 918,474.30 = 312,697.20 : x
  2. Step 2: Convert to fraction form
    612,316.20/918,474.30 = 312,697.20/x
  3. Step 3: Cross multiply
    612,316.20x = 918,474.30 × 312,697.20
  4. Step 4: Simplify right side
    612,316.20x = 287,204,341,881.96
  5. Step 5: Solve for x
    x = 287,204,341,881.96/612,316.20
  6. Step 6: Final answer
    x = 469,045.80

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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.