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Finding the Fourth Proportional to 918.58, 1,376.77 and 528.76

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Solution

The fourth proportional to 918.58, 1,376.77 and 528.76 is: 792.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.58 : 1,376.77 = 528.76 : x
  2. Step 2: Convert to fraction form
    918.58/1,376.77 = 528.76/x
  3. Step 3: Cross multiply
    918.58x = 1,376.77 × 528.76
  4. Step 4: Simplify right side
    918.58x = 727,980.91
  5. Step 5: Solve for x
    x = 727,980.91/918.58
  6. Step 6: Final answer
    x = 792.51

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.