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Finding the Fourth Proportional to 885.58, 1,328.55 and 423.40

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Solution

The fourth proportional to 885.58, 1,328.55 and 423.40 is: 635.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.58 : 1,328.55 = 423.40 : x
  2. Step 2: Convert to fraction form
    885.58/1,328.55 = 423.40/x
  3. Step 3: Cross multiply
    885.58x = 1,328.55 × 423.40
  4. Step 4: Simplify right side
    885.58x = 562,508.07
  5. Step 5: Solve for x
    x = 562,508.07/885.58
  6. Step 6: Final answer
    x = 635.19

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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.