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Finding the Fourth Proportional to 565.02, 780.03 and 390.60

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Solution

The fourth proportional to 565.02, 780.03 and 390.60 is: 539.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    565.02 : 780.03 = 390.60 : x
  2. Step 2: Convert to fraction form
    565.02/780.03 = 390.60/x
  3. Step 3: Cross multiply
    565.02x = 780.03 × 390.60
  4. Step 4: Simplify right side
    565.02x = 304,679.72
  5. Step 5: Solve for x
    x = 304,679.72/565.02
  6. Step 6: Final answer
    x = 539.24

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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.