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Finding the Fourth Proportional to 500,040.64, 690,277.71 and 318,989.98

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Solution

The fourth proportional to 500,040.64, 690,277.71 and 318,989.98 is: 440,347.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    500,040.64 : 690,277.71 = 318,989.98 : x
  2. Step 2: Convert to fraction form
    500,040.64/690,277.71 = 318,989.98/x
  3. Step 3: Cross multiply
    500,040.64x = 690,277.71 × 318,989.98
  4. Step 4: Simplify right side
    500,040.64x = 220,191,672,907.35
  5. Step 5: Solve for x
    x = 220,191,672,907.35/500,040.64
  6. Step 6: Final answer
    x = 440,347.55

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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.