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Finding the Fourth Proportional to 930.95, 1,284.68 and 553.09

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Solution

The fourth proportional to 930.95, 1,284.68 and 553.09 is: 763.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.95 : 1,284.68 = 553.09 : x
  2. Step 2: Convert to fraction form
    930.95/1,284.68 = 553.09/x
  3. Step 3: Cross multiply
    930.95x = 1,284.68 × 553.09
  4. Step 4: Simplify right side
    930.95x = 710,543.66
  5. Step 5: Solve for x
    x = 710,543.66/930.95
  6. Step 6: Final answer
    x = 763.25

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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.