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Finding the Fourth Proportional to 460.40, 687.36 and 387.48

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Solution

The fourth proportional to 460.40, 687.36 and 387.48 is: 578.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    460.40 : 687.36 = 387.48 : x
  2. Step 2: Convert to fraction form
    460.40/687.36 = 387.48/x
  3. Step 3: Cross multiply
    460.40x = 687.36 × 387.48
  4. Step 4: Simplify right side
    460.40x = 266,338.25
  5. Step 5: Solve for x
    x = 266,338.25/460.40
  6. Step 6: Final answer
    x = 578.49

Related Problems

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.