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Finding the Fourth Proportional to 885.93, 1,328.90 and 642.93

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Solution

The fourth proportional to 885.93, 1,328.90 and 642.93 is: 964.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.93 : 1,328.90 = 642.93 : x
  2. Step 2: Convert to fraction form
    885.93/1,328.90 = 642.93/x
  3. Step 3: Cross multiply
    885.93x = 1,328.90 × 642.93
  4. Step 4: Simplify right side
    885.93x = 854,389.68
  5. Step 5: Solve for x
    x = 854,389.68/885.93
  6. Step 6: Final answer
    x = 964.40

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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.