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Finding the Fourth Proportional to 730.10, 1,089.88 and 620.72

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Solution

The fourth proportional to 730.10, 1,089.88 and 620.72 is: 926.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    730.10 : 1,089.88 = 620.72 : x
  2. Step 2: Convert to fraction form
    730.10/1,089.88 = 620.72/x
  3. Step 3: Cross multiply
    730.10x = 1,089.88 × 620.72
  4. Step 4: Simplify right side
    730.10x = 676,510.31
  5. Step 5: Solve for x
    x = 676,510.31/730.10
  6. Step 6: Final answer
    x = 926.60

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.