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Finding the Fourth Proportional to 983.61, 1,356.21 and 651.78

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Solution

The fourth proportional to 983.61, 1,356.21 and 651.78 is: 898.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.61 : 1,356.21 = 651.78 : x
  2. Step 2: Convert to fraction form
    983.61/1,356.21 = 651.78/x
  3. Step 3: Cross multiply
    983.61x = 1,356.21 × 651.78
  4. Step 4: Simplify right side
    983.61x = 883,950.55
  5. Step 5: Solve for x
    x = 883,950.55/983.61
  6. Step 6: Final answer
    x = 898.68

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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.