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Finding the Fourth Proportional to 910.02, 1,362.65 and 780.84

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Solution

The fourth proportional to 910.02, 1,362.65 and 780.84 is: 1,169.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.02 : 1,362.65 = 780.84 : x
  2. Step 2: Convert to fraction form
    910.02/1,362.65 = 780.84/x
  3. Step 3: Cross multiply
    910.02x = 1,362.65 × 780.84
  4. Step 4: Simplify right side
    910.02x = 1,064,007.72
  5. Step 5: Solve for x
    x = 1,064,007.72/910.02
  6. Step 6: Final answer
    x = 1,169.21

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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.