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Finding the Fourth Proportional to 862.40, 1,292.94 and 429.86

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Solution

The fourth proportional to 862.40, 1,292.94 and 429.86 is: 644.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.40 : 1,292.94 = 429.86 : x
  2. Step 2: Convert to fraction form
    862.40/1,292.94 = 429.86/x
  3. Step 3: Cross multiply
    862.40x = 1,292.94 × 429.86
  4. Step 4: Simplify right side
    862.40x = 555,783.19
  5. Step 5: Solve for x
    x = 555,783.19/862.40
  6. Step 6: Final answer
    x = 644.46

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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.