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Finding the Fourth Proportional to 500,315.72, 690,422.94 and 279,554.81

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Solution

The fourth proportional to 500,315.72, 690,422.94 and 279,554.81 is: 385,778.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    500,315.72 : 690,422.94 = 279,554.81 : x
  2. Step 2: Convert to fraction form
    500,315.72/690,422.94 = 279,554.81/x
  3. Step 3: Cross multiply
    500,315.72x = 690,422.94 × 279,554.81
  4. Step 4: Simplify right side
    500,315.72x = 193,011,050,359.23
  5. Step 5: Solve for x
    x = 193,011,050,359.23/500,315.72
  6. Step 6: Final answer
    x = 385,778.51

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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.