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Finding the Fourth Proportional to 885.99, 1,222.70 and 512.90

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Solution

The fourth proportional to 885.99, 1,222.70 and 512.90 is: 707.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.99 : 1,222.70 = 512.90 : x
  2. Step 2: Convert to fraction form
    885.99/1,222.70 = 512.90/x
  3. Step 3: Cross multiply
    885.99x = 1,222.70 × 512.90
  4. Step 4: Simplify right side
    885.99x = 627,121.06
  5. Step 5: Solve for x
    x = 627,121.06/885.99
  6. Step 6: Final answer
    x = 707.82

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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.