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Finding the Fourth Proportional to 885.94, 1,328.90 and 398.86

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Solution

The fourth proportional to 885.94, 1,328.90 and 398.86 is: 598.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.94 : 1,328.90 = 398.86 : x
  2. Step 2: Convert to fraction form
    885.94/1,328.90 = 398.86/x
  3. Step 3: Cross multiply
    885.94x = 1,328.90 × 398.86
  4. Step 4: Simplify right side
    885.94x = 530,045.05
  5. Step 5: Solve for x
    x = 530,045.05/885.94
  6. Step 6: Final answer
    x = 598.29

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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.