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Finding the Fourth Proportional to 885.76, 1,222.30 and 512.72

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Solution

The fourth proportional to 885.76, 1,222.30 and 512.72 is: 707.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.76 : 1,222.30 = 512.72 : x
  2. Step 2: Convert to fraction form
    885.76/1,222.30 = 512.72/x
  3. Step 3: Cross multiply
    885.76x = 1,222.30 × 512.72
  4. Step 4: Simplify right side
    885.76x = 626,691.22
  5. Step 5: Solve for x
    x = 626,691.22/885.76
  6. Step 6: Final answer
    x = 707.52

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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.