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Finding the Fourth Proportional to 391,351.16, 540,121.70 and 219,280.77

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Solution

The fourth proportional to 391,351.16, 540,121.70 and 219,280.77 is: 302,639.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,351.16 : 540,121.70 = 219,280.77 : x
  2. Step 2: Convert to fraction form
    391,351.16/540,121.70 = 219,280.77/x
  3. Step 3: Cross multiply
    391,351.16x = 540,121.70 × 219,280.77
  4. Step 4: Simplify right side
    391,351.16x = 118,438,302,817.91
  5. Step 5: Solve for x
    x = 118,438,302,817.91/391,351.16
  6. Step 6: Final answer
    x = 302,639.46

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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.