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Finding the Fourth Proportional to 1,113.16, 1,670 and 382.56

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Solution

The fourth proportional to 1,113.16, 1,670 and 382.56 is: 573.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,113.16 : 1,670 = 382.56 : x
  2. Step 2: Convert to fraction form
    1,113.16/1,670 = 382.56/x
  3. Step 3: Cross multiply
    1,113.16x = 1,670 × 382.56
  4. Step 4: Simplify right side
    1,113.16x = 638,875.20
  5. Step 5: Solve for x
    x = 638,875.20/1,113.16
  6. Step 6: Final answer
    x = 573.93

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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.