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Finding the Fourth Proportional to 687.07, 946.51 and 644.95

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Solution

The fourth proportional to 687.07, 946.51 and 644.95 is: 888.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.07 : 946.51 = 644.95 : x
  2. Step 2: Convert to fraction form
    687.07/946.51 = 644.95/x
  3. Step 3: Cross multiply
    687.07x = 946.51 × 644.95
  4. Step 4: Simplify right side
    687.07x = 610,451.62
  5. Step 5: Solve for x
    x = 610,451.62/687.07
  6. Step 6: Final answer
    x = 888.49

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Double scale
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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.