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Finding the Fourth Proportional to 427,223.80, 640,932.90 and 249,639.40

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Solution

The fourth proportional to 427,223.80, 640,932.90 and 249,639.40 is: 374,515.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,223.80 : 640,932.90 = 249,639.40 : x
  2. Step 2: Convert to fraction form
    427,223.80/640,932.90 = 249,639.40/x
  3. Step 3: Cross multiply
    427,223.80x = 640,932.90 × 249,639.40
  4. Step 4: Simplify right side
    427,223.80x = 160,002,104,596.26
  5. Step 5: Solve for x
    x = 160,002,104,596.26/427,223.80
  6. Step 6: Final answer
    x = 374,515.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.