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Finding the Fourth Proportional to 687.86, 948.64 and 614.96

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Solution

The fourth proportional to 687.86, 948.64 and 614.96 is: 848.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.86 : 948.64 = 614.96 : x
  2. Step 2: Convert to fraction form
    687.86/948.64 = 614.96/x
  3. Step 3: Cross multiply
    687.86x = 948.64 × 614.96
  4. Step 4: Simplify right side
    687.86x = 583,375.65
  5. Step 5: Solve for x
    x = 583,375.65/687.86
  6. Step 6: Final answer
    x = 848.10

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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.