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Finding the Fourth Proportional to 1,083.48, 1,624.96 and 390.18

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Solution

The fourth proportional to 1,083.48, 1,624.96 and 390.18 is: 585.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,083.48 : 1,624.96 = 390.18 : x
  2. Step 2: Convert to fraction form
    1,083.48/1,624.96 = 390.18/x
  3. Step 3: Cross multiply
    1,083.48x = 1,624.96 × 390.18
  4. Step 4: Simplify right side
    1,083.48x = 634,026.89
  5. Step 5: Solve for x
    x = 634,026.89/1,083.48
  6. Step 6: Final answer
    x = 585.18

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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.