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Finding the Fourth Proportional to 312,638.65, 431,435.70 and 176,669.69

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Solution

The fourth proportional to 312,638.65, 431,435.70 and 176,669.69 is: 243,800.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,638.65 : 431,435.70 = 176,669.69 : x
  2. Step 2: Convert to fraction form
    312,638.65/431,435.70 = 176,669.69/x
  3. Step 3: Cross multiply
    312,638.65x = 431,435.70 × 176,669.69
  4. Step 4: Simplify right side
    312,638.65x = 76,221,609,216.75
  5. Step 5: Solve for x
    x = 76,221,609,216.75/312,638.65
  6. Step 6: Final answer
    x = 243,800.98

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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.