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Finding the Fourth Proportional to 885.99, 1,329.21 and 424.12

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Solution

The fourth proportional to 885.99, 1,329.21 and 424.12 is: 636.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.99 : 1,329.21 = 424.12 : x
  2. Step 2: Convert to fraction form
    885.99/1,329.21 = 424.12/x
  3. Step 3: Cross multiply
    885.99x = 1,329.21 × 424.12
  4. Step 4: Simplify right side
    885.99x = 563,742.42
  5. Step 5: Solve for x
    x = 563,742.42/885.99
  6. Step 6: Final answer
    x = 636.29

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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.