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Finding the Fourth Proportional to 678.40, 936.23 and 429.63

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Solution

The fourth proportional to 678.40, 936.23 and 429.63 is: 592.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.40 : 936.23 = 429.63 : x
  2. Step 2: Convert to fraction form
    678.40/936.23 = 429.63/x
  3. Step 3: Cross multiply
    678.40x = 936.23 × 429.63
  4. Step 4: Simplify right side
    678.40x = 402,226.84
  5. Step 5: Solve for x
    x = 402,226.84/678.40
  6. Step 6: Final answer
    x = 592.91

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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.