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Finding the Fourth Proportional to 321,346.92, 479,147.40 and 312,519

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Solution

The fourth proportional to 321,346.92, 479,147.40 and 312,519 is: 465,984.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    321,346.92 : 479,147.40 = 312,519 : x
  2. Step 2: Convert to fraction form
    321,346.92/479,147.40 = 312,519/x
  3. Step 3: Cross multiply
    321,346.92x = 479,147.40 × 312,519
  4. Step 4: Simplify right side
    321,346.92x = 149,742,666,300.60
  5. Step 5: Solve for x
    x = 149,742,666,300.60/321,346.92
  6. Step 6: Final answer
    x = 465,984.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.