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Finding the Fourth Proportional to 1,007.30, 1,387.47 and 712.06

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Solution

The fourth proportional to 1,007.30, 1,387.47 and 712.06 is: 980.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.30 : 1,387.47 = 712.06 : x
  2. Step 2: Convert to fraction form
    1,007.30/1,387.47 = 712.06/x
  3. Step 3: Cross multiply
    1,007.30x = 1,387.47 × 712.06
  4. Step 4: Simplify right side
    1,007.30x = 987,961.89
  5. Step 5: Solve for x
    x = 987,961.89/1,007.30
  6. Step 6: Final answer
    x = 980.80

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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.