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Finding the Fourth Proportional to 790.52, 1,090.78 and 475.70

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Solution

The fourth proportional to 790.52, 1,090.78 and 475.70 is: 656.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.52 : 1,090.78 = 475.70 : x
  2. Step 2: Convert to fraction form
    790.52/1,090.78 = 475.70/x
  3. Step 3: Cross multiply
    790.52x = 1,090.78 × 475.70
  4. Step 4: Simplify right side
    790.52x = 518,884.05
  5. Step 5: Solve for x
    x = 518,884.05/790.52
  6. Step 6: Final answer
    x = 656.38

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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.