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Finding the Fourth Proportional to 885.63, 1,328.45 and 561.23

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Solution

The fourth proportional to 885.63, 1,328.45 and 561.23 is: 841.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.63 : 1,328.45 = 561.23 : x
  2. Step 2: Convert to fraction form
    885.63/1,328.45 = 561.23/x
  3. Step 3: Cross multiply
    885.63x = 1,328.45 × 561.23
  4. Step 4: Simplify right side
    885.63x = 745,556.55
  5. Step 5: Solve for x
    x = 745,556.55/885.63
  6. Step 6: Final answer
    x = 841.84

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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.