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Finding the Fourth Proportional to 1,048.10, 1,572.15 and 991.40

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Solution

The fourth proportional to 1,048.10, 1,572.15 and 991.40 is: 1,487.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,048.10 : 1,572.15 = 991.40 : x
  2. Step 2: Convert to fraction form
    1,048.10/1,572.15 = 991.40/x
  3. Step 3: Cross multiply
    1,048.10x = 1,572.15 × 991.40
  4. Step 4: Simplify right side
    1,048.10x = 1,558,629.51
  5. Step 5: Solve for x
    x = 1,558,629.51/1,048.10
  6. Step 6: Final answer
    x = 1,487.10

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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.