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Finding the Fourth Proportional to 1,117.56, 1,674.18 and 631.56

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Solution

The fourth proportional to 1,117.56, 1,674.18 and 631.56 is: 946.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,117.56 : 1,674.18 = 631.56 : x
  2. Step 2: Convert to fraction form
    1,117.56/1,674.18 = 631.56/x
  3. Step 3: Cross multiply
    1,117.56x = 1,674.18 × 631.56
  4. Step 4: Simplify right side
    1,117.56x = 1,057,345.12
  5. Step 5: Solve for x
    x = 1,057,345.12/1,117.56
  6. Step 6: Final answer
    x = 946.12

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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.