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Finding the Fourth Proportional to 211,605, 317,426.13 and 78,486.72

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Solution

The fourth proportional to 211,605, 317,426.13 and 78,486.72 is: 117,736.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    211,605 : 317,426.13 = 78,486.72 : x
  2. Step 2: Convert to fraction form
    211,605/317,426.13 = 78,486.72/x
  3. Step 3: Cross multiply
    211,605x = 317,426.13 × 78,486.72
  4. Step 4: Simplify right side
    211,605x = 24,913,735,785.99
  5. Step 5: Solve for x
    x = 24,913,735,785.99/211,605
  6. Step 6: Final answer
    x = 117,736.99

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1.5x scale

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.