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Finding the Fourth Proportional to 898.81, 1,347.99 and 638.05

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Solution

The fourth proportional to 898.81, 1,347.99 and 638.05 is: 956.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.81 : 1,347.99 = 638.05 : x
  2. Step 2: Convert to fraction form
    898.81/1,347.99 = 638.05/x
  3. Step 3: Cross multiply
    898.81x = 1,347.99 × 638.05
  4. Step 4: Simplify right side
    898.81x = 860,085.02
  5. Step 5: Solve for x
    x = 860,085.02/898.81
  6. Step 6: Final answer
    x = 956.92

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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.