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Finding the Fourth Proportional to 1,005.51, 1,386.15 and 710.27

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Solution

The fourth proportional to 1,005.51, 1,386.15 and 710.27 is: 979.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.51 : 1,386.15 = 710.27 : x
  2. Step 2: Convert to fraction form
    1,005.51/1,386.15 = 710.27/x
  3. Step 3: Cross multiply
    1,005.51x = 1,386.15 × 710.27
  4. Step 4: Simplify right side
    1,005.51x = 984,540.76
  5. Step 5: Solve for x
    x = 984,540.76/1,005.51
  6. Step 6: Final answer
    x = 979.15

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1.5x scale

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.