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Finding the Fourth Proportional to 567.30, 782.40 and 390.36

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Solution

The fourth proportional to 567.30, 782.40 and 390.36 is: 538.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    567.30 : 782.40 = 390.36 : x
  2. Step 2: Convert to fraction form
    567.30/782.40 = 390.36/x
  3. Step 3: Cross multiply
    567.30x = 782.40 × 390.36
  4. Step 4: Simplify right side
    567.30x = 305,417.66
  5. Step 5: Solve for x
    x = 305,417.66/567.30
  6. Step 6: Final answer
    x = 538.37

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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.