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Finding the Fourth Proportional to 1,115.47, 1,539.66 and 673.40

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Solution

The fourth proportional to 1,115.47, 1,539.66 and 673.40 is: 929.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.47 : 1,539.66 = 673.40 : x
  2. Step 2: Convert to fraction form
    1,115.47/1,539.66 = 673.40/x
  3. Step 3: Cross multiply
    1,115.47x = 1,539.66 × 673.40
  4. Step 4: Simplify right side
    1,115.47x = 1,036,799.35
  5. Step 5: Solve for x
    x = 1,036,799.35/1,115.47
  6. Step 6: Final answer
    x = 929.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.