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Finding the Fourth Proportional to 1,038.76, 1,558.20 and 491.47

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Solution

The fourth proportional to 1,038.76, 1,558.20 and 491.47 is: 737.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.76 : 1,558.20 = 491.47 : x
  2. Step 2: Convert to fraction form
    1,038.76/1,558.20 = 491.47/x
  3. Step 3: Cross multiply
    1,038.76x = 1,558.20 × 491.47
  4. Step 4: Simplify right side
    1,038.76x = 765,806.50
  5. Step 5: Solve for x
    x = 765,806.50/1,038.76
  6. Step 6: Final answer
    x = 737.23

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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.