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Finding the Fourth Proportional to 885.19, 1,220.79 and 553.30

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Solution

The fourth proportional to 885.19, 1,220.79 and 553.30 is: 763.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.19 : 1,220.79 = 553.30 : x
  2. Step 2: Convert to fraction form
    885.19/1,220.79 = 553.30/x
  3. Step 3: Cross multiply
    885.19x = 1,220.79 × 553.30
  4. Step 4: Simplify right side
    885.19x = 675,463.11
  5. Step 5: Solve for x
    x = 675,463.11/885.19
  6. Step 6: Final answer
    x = 763.07

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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.