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Finding the Fourth Proportional to 975.42, 1,346.46 and 621.66

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Solution

The fourth proportional to 975.42, 1,346.46 and 621.66 is: 858.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    975.42 : 1,346.46 = 621.66 : x
  2. Step 2: Convert to fraction form
    975.42/1,346.46 = 621.66/x
  3. Step 3: Cross multiply
    975.42x = 1,346.46 × 621.66
  4. Step 4: Simplify right side
    975.42x = 837,040.32
  5. Step 5: Solve for x
    x = 837,040.32/975.42
  6. Step 6: Final answer
    x = 858.13

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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.