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Finding the Fourth Proportional to 1,155.16, 1,732.74 and 385.66

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Solution

The fourth proportional to 1,155.16, 1,732.74 and 385.66 is: 578.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,155.16 : 1,732.74 = 385.66 : x
  2. Step 2: Convert to fraction form
    1,155.16/1,732.74 = 385.66/x
  3. Step 3: Cross multiply
    1,155.16x = 1,732.74 × 385.66
  4. Step 4: Simplify right side
    1,155.16x = 668,248.51
  5. Step 5: Solve for x
    x = 668,248.51/1,155.16
  6. Step 6: Final answer
    x = 578.49

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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.