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Finding the Fourth Proportional to 885.84, 1,222.34 and 512.78

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Solution

The fourth proportional to 885.84, 1,222.34 and 512.78 is: 707.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.84 : 1,222.34 = 512.78 : x
  2. Step 2: Convert to fraction form
    885.84/1,222.34 = 512.78/x
  3. Step 3: Cross multiply
    885.84x = 1,222.34 × 512.78
  4. Step 4: Simplify right side
    885.84x = 626,791.51
  5. Step 5: Solve for x
    x = 626,791.51/885.84
  6. Step 6: Final answer
    x = 707.57

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.