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Finding the Fourth Proportional to 917.02, 1,265.51 and 518.65

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Solution

The fourth proportional to 917.02, 1,265.51 and 518.65 is: 715.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.02 : 1,265.51 = 518.65 : x
  2. Step 2: Convert to fraction form
    917.02/1,265.51 = 518.65/x
  3. Step 3: Cross multiply
    917.02x = 1,265.51 × 518.65
  4. Step 4: Simplify right side
    917.02x = 656,356.76
  5. Step 5: Solve for x
    x = 656,356.76/917.02
  6. Step 6: Final answer
    x = 715.75

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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.