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Finding the Fourth Proportional to 677.84, 936.08 and 492.40

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Solution

The fourth proportional to 677.84, 936.08 and 492.40 is: 679.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    677.84 : 936.08 = 492.40 : x
  2. Step 2: Convert to fraction form
    677.84/936.08 = 492.40/x
  3. Step 3: Cross multiply
    677.84x = 936.08 × 492.40
  4. Step 4: Simplify right side
    677.84x = 460,925.79
  5. Step 5: Solve for x
    x = 460,925.79/677.84
  6. Step 6: Final answer
    x = 679.99

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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.