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Finding the Fourth Proportional to 790.17, 1,089.29 and 553.38

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Solution

The fourth proportional to 790.17, 1,089.29 and 553.38 is: 762.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.17 : 1,089.29 = 553.38 : x
  2. Step 2: Convert to fraction form
    790.17/1,089.29 = 553.38/x
  3. Step 3: Cross multiply
    790.17x = 1,089.29 × 553.38
  4. Step 4: Simplify right side
    790.17x = 602,792.68
  5. Step 5: Solve for x
    x = 602,792.68/790.17
  6. Step 6: Final answer
    x = 762.86

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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.