Home / 786,000.30-1,179,000.45-287,558.70

Finding the Fourth Proportional to 786,000.30, 1,179,000.45 and 287,558.70

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Solution

The fourth proportional to 786,000.30, 1,179,000.45 and 287,558.70 is: 431,338.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    786,000.30 : 1,179,000.45 = 287,558.70 : x
  2. Step 2: Convert to fraction form
    786,000.30/1,179,000.45 = 287,558.70/x
  3. Step 3: Cross multiply
    786,000.30x = 1,179,000.45 × 287,558.70
  4. Step 4: Simplify right side
    786,000.30x = 339,031,836,701.42
  5. Step 5: Solve for x
    x = 339,031,836,701.42/786,000.30
  6. Step 6: Final answer
    x = 431,338.05

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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.