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Finding the Fourth Proportional to 841.56, 1,263.12 and 430.99

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Solution

The fourth proportional to 841.56, 1,263.12 and 430.99 is: 646.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.56 : 1,263.12 = 430.99 : x
  2. Step 2: Convert to fraction form
    841.56/1,263.12 = 430.99/x
  3. Step 3: Cross multiply
    841.56x = 1,263.12 × 430.99
  4. Step 4: Simplify right side
    841.56x = 544,392.09
  5. Step 5: Solve for x
    x = 544,392.09/841.56
  6. Step 6: Final answer
    x = 646.88

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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.