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Finding the Fourth Proportional to 661.70, 912.80 and 614.82

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Solution

The fourth proportional to 661.70, 912.80 and 614.82 is: 848.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.70 : 912.80 = 614.82 : x
  2. Step 2: Convert to fraction form
    661.70/912.80 = 614.82/x
  3. Step 3: Cross multiply
    661.70x = 912.80 × 614.82
  4. Step 4: Simplify right side
    661.70x = 561,207.70
  5. Step 5: Solve for x
    x = 561,207.70/661.70
  6. Step 6: Final answer
    x = 848.13

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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.