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Finding the Fourth Proportional to 1,007.63, 1,389.07 and 707.97

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Solution

The fourth proportional to 1,007.63, 1,389.07 and 707.97 is: 975.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.63 : 1,389.07 = 707.97 : x
  2. Step 2: Convert to fraction form
    1,007.63/1,389.07 = 707.97/x
  3. Step 3: Cross multiply
    1,007.63x = 1,389.07 × 707.97
  4. Step 4: Simplify right side
    1,007.63x = 983,419.89
  5. Step 5: Solve for x
    x = 983,419.89/1,007.63
  6. Step 6: Final answer
    x = 975.97

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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.