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Finding the Fourth Proportional to 753.02, 1,040.47 and 621.80

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Solution

The fourth proportional to 753.02, 1,040.47 and 621.80 is: 859.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.02 : 1,040.47 = 621.80 : x
  2. Step 2: Convert to fraction form
    753.02/1,040.47 = 621.80/x
  3. Step 3: Cross multiply
    753.02x = 1,040.47 × 621.80
  4. Step 4: Simplify right side
    753.02x = 646,961.39
  5. Step 5: Solve for x
    x = 646,961.39/753.02
  6. Step 6: Final answer
    x = 859.16

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.