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Finding the Fourth Proportional to 318,371.45, 439,312.71 and 215,230.10

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Solution

The fourth proportional to 318,371.45, 439,312.71 and 215,230.10 is: 296,990.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,371.45 : 439,312.71 = 215,230.10 : x
  2. Step 2: Convert to fraction form
    318,371.45/439,312.71 = 215,230.10/x
  3. Step 3: Cross multiply
    318,371.45x = 439,312.71 × 215,230.10
  4. Step 4: Simplify right side
    318,371.45x = 94,553,317,115.12
  5. Step 5: Solve for x
    x = 94,553,317,115.12/318,371.45
  6. Step 6: Final answer
    x = 296,990.57

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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.