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Finding the Fourth Proportional to 1,538.10, 2,303.10 and 987.30

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Solution

The fourth proportional to 1,538.10, 2,303.10 and 987.30 is: 1,478.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,538.10 : 2,303.10 = 987.30 : x
  2. Step 2: Convert to fraction form
    1,538.10/2,303.10 = 987.30/x
  3. Step 3: Cross multiply
    1,538.10x = 2,303.10 × 987.30
  4. Step 4: Simplify right side
    1,538.10x = 2,273,850.63
  5. Step 5: Solve for x
    x = 2,273,850.63/1,538.10
  6. Step 6: Final answer
    x = 1,478.35

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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.