Home / 385,187.28-531,558.09-215,421

Finding the Fourth Proportional to 385,187.28, 531,558.09 and 215,421

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Solution

The fourth proportional to 385,187.28, 531,558.09 and 215,421 is: 297,280.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,187.28 : 531,558.09 = 215,421 : x
  2. Step 2: Convert to fraction form
    385,187.28/531,558.09 = 215,421/x
  3. Step 3: Cross multiply
    385,187.28x = 531,558.09 × 215,421
  4. Step 4: Simplify right side
    385,187.28x = 114,508,775,305.89
  5. Step 5: Solve for x
    x = 114,508,775,305.89/385,187.28
  6. Step 6: Final answer
    x = 297,280.78

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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.