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Finding the Fourth Proportional to 816.64, 1,126.40 and 467.20

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Solution

The fourth proportional to 816.64, 1,126.40 and 467.20 is: 644.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.64 : 1,126.40 = 467.20 : x
  2. Step 2: Convert to fraction form
    816.64/1,126.40 = 467.20/x
  3. Step 3: Cross multiply
    816.64x = 1,126.40 × 467.20
  4. Step 4: Simplify right side
    816.64x = 526,254.08
  5. Step 5: Solve for x
    x = 526,254.08/816.64
  6. Step 6: Final answer
    x = 644.41

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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.