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Finding the Fourth Proportional to 651.15, 898.79 and 618.09

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Solution

The fourth proportional to 651.15, 898.79 and 618.09 is: 853.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.15 : 898.79 = 618.09 : x
  2. Step 2: Convert to fraction form
    651.15/898.79 = 618.09/x
  3. Step 3: Cross multiply
    651.15x = 898.79 × 618.09
  4. Step 4: Simplify right side
    651.15x = 555,533.11
  5. Step 5: Solve for x
    x = 555,533.11/651.15
  6. Step 6: Final answer
    x = 853.16

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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.