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Finding the Fourth Proportional to 972.59, 1,342.32 and 618.80

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Solution

The fourth proportional to 972.59, 1,342.32 and 618.80 is: 854.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.59 : 1,342.32 = 618.80 : x
  2. Step 2: Convert to fraction form
    972.59/1,342.32 = 618.80/x
  3. Step 3: Cross multiply
    972.59x = 1,342.32 × 618.80
  4. Step 4: Simplify right side
    972.59x = 830,627.62
  5. Step 5: Solve for x
    x = 830,627.62/972.59
  6. Step 6: Final answer
    x = 854.04

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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.