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Finding the Fourth Proportional to 321,966.40, 438,620.80 and 321,966.40

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Solution

The fourth proportional to 321,966.40, 438,620.80 and 321,966.40 is: 438,620.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    321,966.40 : 438,620.80 = 321,966.40 : x
  2. Step 2: Convert to fraction form
    321,966.40/438,620.80 = 321,966.40/x
  3. Step 3: Cross multiply
    321,966.40x = 438,620.80 × 321,966.40
  4. Step 4: Simplify right side
    321,966.40x = 141,221,159,941.12
  5. Step 5: Solve for x
    x = 141,221,159,941.12/321,966.40
  6. Step 6: Final answer
    x = 438,620.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.