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Finding the Fourth Proportional to 931.06, 1,390.69 and 785.26

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Solution

The fourth proportional to 931.06, 1,390.69 and 785.26 is: 1,172.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.06 : 1,390.69 = 785.26 : x
  2. Step 2: Convert to fraction form
    931.06/1,390.69 = 785.26/x
  3. Step 3: Cross multiply
    931.06x = 1,390.69 × 785.26
  4. Step 4: Simplify right side
    931.06x = 1,092,053.23
  5. Step 5: Solve for x
    x = 1,092,053.23/931.06
  6. Step 6: Final answer
    x = 1,172.91

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.