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Finding the Fourth Proportional to 841.68, 1,259.58 and 621.80

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Solution

The fourth proportional to 841.68, 1,259.58 and 621.80 is: 930.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.68 : 1,259.58 = 621.80 : x
  2. Step 2: Convert to fraction form
    841.68/1,259.58 = 621.80/x
  3. Step 3: Cross multiply
    841.68x = 1,259.58 × 621.80
  4. Step 4: Simplify right side
    841.68x = 783,206.84
  5. Step 5: Solve for x
    x = 783,206.84/841.68
  6. Step 6: Final answer
    x = 930.53

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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.