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Finding the Fourth Proportional to 875.29, 1,312.28 and 528.55

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Solution

The fourth proportional to 875.29, 1,312.28 and 528.55 is: 792.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.29 : 1,312.28 = 528.55 : x
  2. Step 2: Convert to fraction form
    875.29/1,312.28 = 528.55/x
  3. Step 3: Cross multiply
    875.29x = 1,312.28 × 528.55
  4. Step 4: Simplify right side
    875.29x = 693,611.02
  5. Step 5: Solve for x
    x = 693,611.02/875.29
  6. Step 6: Final answer
    x = 792.43

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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.