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Finding the Fourth Proportional to 988.46, 1,364.58 and 634.91

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Solution

The fourth proportional to 988.46, 1,364.58 and 634.91 is: 876.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.46 : 1,364.58 = 634.91 : x
  2. Step 2: Convert to fraction form
    988.46/1,364.58 = 634.91/x
  3. Step 3: Cross multiply
    988.46x = 1,364.58 × 634.91
  4. Step 4: Simplify right side
    988.46x = 866,386.34
  5. Step 5: Solve for x
    x = 866,386.34/988.46
  6. Step 6: Final answer
    x = 876.50

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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.