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Finding the Fourth Proportional to 879.08, 1,213.20 and 525.16

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Solution

The fourth proportional to 879.08, 1,213.20 and 525.16 is: 724.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.08 : 1,213.20 = 525.16 : x
  2. Step 2: Convert to fraction form
    879.08/1,213.20 = 525.16/x
  3. Step 3: Cross multiply
    879.08x = 1,213.20 × 525.16
  4. Step 4: Simplify right side
    879.08x = 637,124.11
  5. Step 5: Solve for x
    x = 637,124.11/879.08
  6. Step 6: Final answer
    x = 724.76

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Double scale
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1.5x scale

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.