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Finding the Fourth Proportional to 841.26, 1,261.26 and 430.20

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Solution

The fourth proportional to 841.26, 1,261.26 and 430.20 is: 644.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.26 : 1,261.26 = 430.20 : x
  2. Step 2: Convert to fraction form
    841.26/1,261.26 = 430.20/x
  3. Step 3: Cross multiply
    841.26x = 1,261.26 × 430.20
  4. Step 4: Simplify right side
    841.26x = 542,594.05
  5. Step 5: Solve for x
    x = 542,594.05/841.26
  6. Step 6: Final answer
    x = 644.98

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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.