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Finding the Fourth Proportional to 556.31, 829.55 and 479.76

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Solution

The fourth proportional to 556.31, 829.55 and 479.76 is: 715.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    556.31 : 829.55 = 479.76 : x
  2. Step 2: Convert to fraction form
    556.31/829.55 = 479.76/x
  3. Step 3: Cross multiply
    556.31x = 829.55 × 479.76
  4. Step 4: Simplify right side
    556.31x = 397,982.51
  5. Step 5: Solve for x
    x = 397,982.51/556.31
  6. Step 6: Final answer
    x = 715.40

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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.