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Finding the Fourth Proportional to 318,700.84, 438,857.98 and 311,628.32

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Solution

The fourth proportional to 318,700.84, 438,857.98 and 311,628.32 is: 429,118.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,700.84 : 438,857.98 = 311,628.32 : x
  2. Step 2: Convert to fraction form
    318,700.84/438,857.98 = 311,628.32/x
  3. Step 3: Cross multiply
    318,700.84x = 438,857.98 × 311,628.32
  4. Step 4: Simplify right side
    318,700.84x = 136,760,575,025.99
  5. Step 5: Solve for x
    x = 136,760,575,025.99/318,700.84
  6. Step 6: Final answer
    x = 429,118.97

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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.