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Finding the Fourth Proportional to 885.12, 1,222.80 and 624.48

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Solution

The fourth proportional to 885.12, 1,222.80 and 624.48 is: 862.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.12 : 1,222.80 = 624.48 : x
  2. Step 2: Convert to fraction form
    885.12/1,222.80 = 624.48/x
  3. Step 3: Cross multiply
    885.12x = 1,222.80 × 624.48
  4. Step 4: Simplify right side
    885.12x = 763,614.14
  5. Step 5: Solve for x
    x = 763,614.14/885.12
  6. Step 6: Final answer
    x = 862.72

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.