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Finding the Fourth Proportional to 953.80, 1,315.90 and 580.66

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Solution

The fourth proportional to 953.80, 1,315.90 and 580.66 is: 801.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    953.80 : 1,315.90 = 580.66 : x
  2. Step 2: Convert to fraction form
    953.80/1,315.90 = 580.66/x
  3. Step 3: Cross multiply
    953.80x = 1,315.90 × 580.66
  4. Step 4: Simplify right side
    953.80x = 764,090.49
  5. Step 5: Solve for x
    x = 764,090.49/953.80
  6. Step 6: Final answer
    x = 801.10

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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.