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Finding the Fourth Proportional to 661.08, 910.70 and 556.17

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Solution

The fourth proportional to 661.08, 910.70 and 556.17 is: 766.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.08 : 910.70 = 556.17 : x
  2. Step 2: Convert to fraction form
    661.08/910.70 = 556.17/x
  3. Step 3: Cross multiply
    661.08x = 910.70 × 556.17
  4. Step 4: Simplify right side
    661.08x = 506,504.02
  5. Step 5: Solve for x
    x = 506,504.02/661.08
  6. Step 6: Final answer
    x = 766.18

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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.