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Finding the Fourth Proportional to 862.24, 1,292.72 and 429.12

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Solution

The fourth proportional to 862.24, 1,292.72 and 429.12 is: 643.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.24 : 1,292.72 = 429.12 : x
  2. Step 2: Convert to fraction form
    862.24/1,292.72 = 429.12/x
  3. Step 3: Cross multiply
    862.24x = 1,292.72 × 429.12
  4. Step 4: Simplify right side
    862.24x = 554,732.01
  5. Step 5: Solve for x
    x = 554,732.01/862.24
  6. Step 6: Final answer
    x = 643.36

Related Problems

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.