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Finding the Fourth Proportional to 312,595.20, 430,790.40 and 307,929.60

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Solution

The fourth proportional to 312,595.20, 430,790.40 and 307,929.60 is: 424,360.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,595.20 : 430,790.40 = 307,929.60 : x
  2. Step 2: Convert to fraction form
    312,595.20/430,790.40 = 307,929.60/x
  3. Step 3: Cross multiply
    312,595.20x = 430,790.40 × 307,929.60
  4. Step 4: Simplify right side
    312,595.20x = 132,653,115,555.84
  5. Step 5: Solve for x
    x = 132,653,115,555.84/312,595.20
  6. Step 6: Final answer
    x = 424,360.69

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.