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Finding the Fourth Proportional to 898.85, 1,347.28 and 678.76

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Solution

The fourth proportional to 898.85, 1,347.28 and 678.76 is: 1,017.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.85 : 1,347.28 = 678.76 : x
  2. Step 2: Convert to fraction form
    898.85/1,347.28 = 678.76/x
  3. Step 3: Cross multiply
    898.85x = 1,347.28 × 678.76
  4. Step 4: Simplify right side
    898.85x = 914,477.36
  5. Step 5: Solve for x
    x = 914,477.36/898.85
  6. Step 6: Final answer
    x = 1,017.39

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.