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Finding the Fourth Proportional to 759.47, 1,047.60 and 479.48

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Solution

The fourth proportional to 759.47, 1,047.60 and 479.48 is: 661.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.47 : 1,047.60 = 479.48 : x
  2. Step 2: Convert to fraction form
    759.47/1,047.60 = 479.48/x
  3. Step 3: Cross multiply
    759.47x = 1,047.60 × 479.48
  4. Step 4: Simplify right side
    759.47x = 502,298.01
  5. Step 5: Solve for x
    x = 502,298.01/759.47
  6. Step 6: Final answer
    x = 661.38

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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.