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Finding the Fourth Proportional to 918.06, 1,374.06 and 621.18

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Solution

The fourth proportional to 918.06, 1,374.06 and 621.18 is: 929.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.06 : 1,374.06 = 621.18 : x
  2. Step 2: Convert to fraction form
    918.06/1,374.06 = 621.18/x
  3. Step 3: Cross multiply
    918.06x = 1,374.06 × 621.18
  4. Step 4: Simplify right side
    918.06x = 853,538.59
  5. Step 5: Solve for x
    x = 853,538.59/918.06
  6. Step 6: Final answer
    x = 929.72

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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.