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Finding the Fourth Proportional to 859.28, 1,185.28 and 509.88

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Solution

The fourth proportional to 859.28, 1,185.28 and 509.88 is: 703.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.28 : 1,185.28 = 509.88 : x
  2. Step 2: Convert to fraction form
    859.28/1,185.28 = 509.88/x
  3. Step 3: Cross multiply
    859.28x = 1,185.28 × 509.88
  4. Step 4: Simplify right side
    859.28x = 604,350.57
  5. Step 5: Solve for x
    x = 604,350.57/859.28
  6. Step 6: Final answer
    x = 703.32

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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.