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Finding the Fourth Proportional to 691.46, 955.56 and 618.56

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Solution

The fourth proportional to 691.46, 955.56 and 618.56 is: 854.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.46 : 955.56 = 618.56 : x
  2. Step 2: Convert to fraction form
    691.46/955.56 = 618.56/x
  3. Step 3: Cross multiply
    691.46x = 955.56 × 618.56
  4. Step 4: Simplify right side
    691.46x = 591,071.19
  5. Step 5: Solve for x
    x = 591,071.19/691.46
  6. Step 6: Final answer
    x = 854.82

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1.5x scale

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.