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Finding the Fourth Proportional to 910.58, 1,365.06 and 666.78

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Solution

The fourth proportional to 910.58, 1,365.06 and 666.78 is: 999.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.58 : 1,365.06 = 666.78 : x
  2. Step 2: Convert to fraction form
    910.58/1,365.06 = 666.78/x
  3. Step 3: Cross multiply
    910.58x = 1,365.06 × 666.78
  4. Step 4: Simplify right side
    910.58x = 910,194.71
  5. Step 5: Solve for x
    x = 910,194.71/910.58
  6. Step 6: Final answer
    x = 999.58

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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.