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Finding the Fourth Proportional to 556.40, 836.40 and 477.20

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Solution

The fourth proportional to 556.40, 836.40 and 477.20 is: 717.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    556.40 : 836.40 = 477.20 : x
  2. Step 2: Convert to fraction form
    556.40/836.40 = 477.20/x
  3. Step 3: Cross multiply
    556.40x = 836.40 × 477.20
  4. Step 4: Simplify right side
    556.40x = 399,130.08
  5. Step 5: Solve for x
    x = 399,130.08/556.40
  6. Step 6: Final answer
    x = 717.34

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.