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Finding the Fourth Proportional to 1,005.90, 1,384.47 and 874.14

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Solution

The fourth proportional to 1,005.90, 1,384.47 and 874.14 is: 1,203.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.90 : 1,384.47 = 874.14 : x
  2. Step 2: Convert to fraction form
    1,005.90/1,384.47 = 874.14/x
  3. Step 3: Cross multiply
    1,005.90x = 1,384.47 × 874.14
  4. Step 4: Simplify right side
    1,005.90x = 1,210,220.61
  5. Step 5: Solve for x
    x = 1,210,220.61/1,005.90
  6. Step 6: Final answer
    x = 1,203.12

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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.