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Finding the Fourth Proportional to 391,072.65, 539,401.41 and 358,910.91

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Solution

The fourth proportional to 391,072.65, 539,401.41 and 358,910.91 is: 495,041.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,072.65 : 539,401.41 = 358,910.91 : x
  2. Step 2: Convert to fraction form
    391,072.65/539,401.41 = 358,910.91/x
  3. Step 3: Cross multiply
    391,072.65x = 539,401.41 × 358,910.91
  4. Step 4: Simplify right side
    391,072.65x = 193,597,050,918.38
  5. Step 5: Solve for x
    x = 193,597,050,918.38/391,072.65
  6. Step 6: Final answer
    x = 495,041.14

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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.