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Finding the Fourth Proportional to 565.60, 779.28 and 390.64

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Solution

The fourth proportional to 565.60, 779.28 and 390.64 is: 538.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    565.60 : 779.28 = 390.64 : x
  2. Step 2: Convert to fraction form
    565.60/779.28 = 390.64/x
  3. Step 3: Cross multiply
    565.60x = 779.28 × 390.64
  4. Step 4: Simplify right side
    565.60x = 304,417.94
  5. Step 5: Solve for x
    x = 304,417.94/565.60
  6. Step 6: Final answer
    x = 538.22

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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.