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Finding the Fourth Proportional to 885.15, 1,221.35 and 663.63

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Solution

The fourth proportional to 885.15, 1,221.35 and 663.63 is: 915.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.15 : 1,221.35 = 663.63 : x
  2. Step 2: Convert to fraction form
    885.15/1,221.35 = 663.63/x
  3. Step 3: Cross multiply
    885.15x = 1,221.35 × 663.63
  4. Step 4: Simplify right side
    885.15x = 810,521.18
  5. Step 5: Solve for x
    x = 810,521.18/885.15
  6. Step 6: Final answer
    x = 915.69

Related Problems

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Half scale
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Double scale
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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.