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Finding the Fourth Proportional to 910.16, 1,365 and 389.96

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Solution

The fourth proportional to 910.16, 1,365 and 389.96 is: 584.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.16 : 1,365 = 389.96 : x
  2. Step 2: Convert to fraction form
    910.16/1,365 = 389.96/x
  3. Step 3: Cross multiply
    910.16x = 1,365 × 389.96
  4. Step 4: Simplify right side
    910.16x = 532,295.40
  5. Step 5: Solve for x
    x = 532,295.40/910.16
  6. Step 6: Final answer
    x = 584.84

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.