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Finding the Fourth Proportional to 1,148.63, 1,720.62 and 871.47

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Solution

The fourth proportional to 1,148.63, 1,720.62 and 871.47 is: 1,305.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,148.63 : 1,720.62 = 871.47 : x
  2. Step 2: Convert to fraction form
    1,148.63/1,720.62 = 871.47/x
  3. Step 3: Cross multiply
    1,148.63x = 1,720.62 × 871.47
  4. Step 4: Simplify right side
    1,148.63x = 1,499,468.71
  5. Step 5: Solve for x
    x = 1,499,468.71/1,148.63
  6. Step 6: Final answer
    x = 1,305.45

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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.