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Finding the Fourth Proportional to 931.18, 1,386.12 and 917.33

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Solution

The fourth proportional to 931.18, 1,386.12 and 917.33 is: 1,365.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.18 : 1,386.12 = 917.33 : x
  2. Step 2: Convert to fraction form
    931.18/1,386.12 = 917.33/x
  3. Step 3: Cross multiply
    931.18x = 1,386.12 × 917.33
  4. Step 4: Simplify right side
    931.18x = 1,271,529.46
  5. Step 5: Solve for x
    x = 1,271,529.46/931.18
  6. Step 6: Final answer
    x = 1,365.50

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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.