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Finding the Fourth Proportional to 1,005.45, 1,387.59 and 585.90

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Solution

The fourth proportional to 1,005.45, 1,387.59 and 585.90 is: 808.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.45 : 1,387.59 = 585.90 : x
  2. Step 2: Convert to fraction form
    1,005.45/1,387.59 = 585.90/x
  3. Step 3: Cross multiply
    1,005.45x = 1,387.59 × 585.90
  4. Step 4: Simplify right side
    1,005.45x = 812,988.98
  5. Step 5: Solve for x
    x = 812,988.98/1,005.45
  6. Step 6: Final answer
    x = 808.58

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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.