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Finding the Fourth Proportional to 1,005.10, 1,386.87 and 562.93

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Solution

The fourth proportional to 1,005.10, 1,386.87 and 562.93 is: 776.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.10 : 1,386.87 = 562.93 : x
  2. Step 2: Convert to fraction form
    1,005.10/1,386.87 = 562.93/x
  3. Step 3: Cross multiply
    1,005.10x = 1,386.87 × 562.93
  4. Step 4: Simplify right side
    1,005.10x = 780,710.73
  5. Step 5: Solve for x
    x = 780,710.73/1,005.10
  6. Step 6: Final answer
    x = 776.75

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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.