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Finding the Fourth Proportional to 838.34, 1,154.75 and 705.40

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Solution

The fourth proportional to 838.34, 1,154.75 and 705.40 is: 971.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.34 : 1,154.75 = 705.40 : x
  2. Step 2: Convert to fraction form
    838.34/1,154.75 = 705.40/x
  3. Step 3: Cross multiply
    838.34x = 1,154.75 × 705.40
  4. Step 4: Simplify right side
    838.34x = 814,559.53
  5. Step 5: Solve for x
    x = 814,559.53/838.34
  6. Step 6: Final answer
    x = 971.63

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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.