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Finding the Fourth Proportional to 1,239.36, 1,710.57 and 715.32

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Solution

The fourth proportional to 1,239.36, 1,710.57 and 715.32 is: 987.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.36 : 1,710.57 = 715.32 : x
  2. Step 2: Convert to fraction form
    1,239.36/1,710.57 = 715.32/x
  3. Step 3: Cross multiply
    1,239.36x = 1,710.57 × 715.32
  4. Step 4: Simplify right side
    1,239.36x = 1,223,604.93
  5. Step 5: Solve for x
    x = 1,223,604.93/1,239.36
  6. Step 6: Final answer
    x = 987.29

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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.