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Finding the Fourth Proportional to 1,005.48, 1,387.64 and 612.54

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Solution

The fourth proportional to 1,005.48, 1,387.64 and 612.54 is: 845.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.48 : 1,387.64 = 612.54 : x
  2. Step 2: Convert to fraction form
    1,005.48/1,387.64 = 612.54/x
  3. Step 3: Cross multiply
    1,005.48x = 1,387.64 × 612.54
  4. Step 4: Simplify right side
    1,005.48x = 849,981.94
  5. Step 5: Solve for x
    x = 849,981.94/1,005.48
  6. Step 6: Final answer
    x = 845.35

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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.