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Finding the Fourth Proportional to 941.71, 1,298.53 and 642.99

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Solution

The fourth proportional to 941.71, 1,298.53 and 642.99 is: 886.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    941.71 : 1,298.53 = 642.99 : x
  2. Step 2: Convert to fraction form
    941.71/1,298.53 = 642.99/x
  3. Step 3: Cross multiply
    941.71x = 1,298.53 × 642.99
  4. Step 4: Simplify right side
    941.71x = 834,941.80
  5. Step 5: Solve for x
    x = 834,941.80/941.71
  6. Step 6: Final answer
    x = 886.62

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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.